More than 140 people are feared buried alive after torrential rain touched off a landslide in southwestern China, according to news agency reports.

The landslide hit the village of Xinmo, in Maoxin county of Sichuan province, at about 6am local time, the Xinhua report said.

A couple and a baby were rescued and taken to hospital after 46 homes in Xinmo were destroyed by boulders when the side of a mountain collapsed, according to the Maoxin county government.

Maoxian county is home to about 110,000 people, according to the government's website.

The landslide also blocked a 2km-section of a river. Wang Yongbo, a local rescue official, told state broadcaster CCTV that an estimated three million cubic metres of earth and rock had slid down the mountain.

Xinmo is known locally for tourism and Chinese reports said it was unclear if tourists were among the people buried by the landslide.