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China has called a mission by the UN rights chief a chance to "clarify misinformation" ahead of as Uyghurs warned a public relations stunt may lie in wait.

The ruling Communist Party is accused of and other Muslim minorities in the far-western region as part of a years-long crackdown the United States and lawmakers in other Western countries have labelled a "genocide".

China vehemently denies the allegations, calling them the "lie of the century".

Bachelet is expected to visit the cities of Urumqi and Kashgar on Tuesday and Wednesday as part of a six-day tour.

She met Foreign Minister Wang Yi ahead of her journey to Xinjiang, who also "expressed the hope that this trip would help enhance understanding and cooperation," according to a readout of the meeting released late Monday.

But raised doubts about her presence if the trip is as highly-controlled as expected.

Nursimangul Abdureshid, a Uyghur said she was "not very hopeful that her trip can bring any change".

"I request them to visit victims like my family members, not the pre-prepared scenes by the Chinese government," she told AFP.

"If the UN team cannot have unlimited access in Xinjiang, I will not accept their so-called reports."

Another Uyghur, Jevlan Shirememet, called on Bachelet to help him contact his mother who he has not seen for four years.

The Turkey-based 31-year-old - from the province's northern reaches near the border with Kazakhstan -Ìýalso said he hoped Bachelet would venture further than her itinerary.

"I don't know why she can't visit these places," he told AFP.

Regional capital Urumqi is home to many of the government agencies believed to be behind the province-wide campaign China has described as a crackdown on religious extremism.

The city of four million has a sizeable Uyghur community and was the site of deadly ethnic clashes in 2009 as well as two attacks in 2014.

Kashgar - home to 700,000 people - lies in the Uyghur heartland of southern Xinjiang.

An ancient Silk Road city, it has been a major target of researchers and activists say, with authorities accused of smothering the cultural hub in a high-tech security blanket while bulldozing Uyghur homes and religious sites.

The outskirts of both cities are pockmarked with what are believed to be detention camps, part of a sprawling network of recently built facilities stretching across the remote province.

Campaigners have voiced concern that Chinese authorities will prevent Bachelet from conducting a thorough probe into alleged and instead give her a stage-managed tour with limited access.

"We are very worried that this visit comes with few benefits for victims and activists, for a very high political cost," said Raphael David from the International Service for Human Rights.

The US said it is "deeply concerned" that she had not secured guarantees on what she will see, adding that she was unlikely to get an "unmanipulated" picture of China's rights situation.

Bachelet on Monday gave assurances about her access to detention centres and rights defenders during a virtual meeting with the heads of dozens of diplomatic missions in China, according to diplomatic sources in Beijing.

"Bachelet needs to understand that what's stake is the world's confidence in the UN and her very own Office's ability to respond to a human rights crisis in a major power," added David.

Caroline Wilson, the UK's ambassador to , was on the call and tweeted that she stressed "the importance of unfettered access to Xinjiang and private conversations with its people".

Bachelet's office has also said she will meet with civil society organisations, business representatives and academics.

In addition to mass detentions, Chinese authorities have in Xinjiang, researchers and campaigners say.

Uyghurs overseas have staged rallies in recent weeks pressing Bachelet to visit relatives believed to be detained in Xinjiang.