Rescue teams had rushed to the site of the landslide, which occurred at around 6:56 a.m. on Tuesday (2256 GMT Monday) at Rencang village in Dangchang County, state news agency Xinhua said.
"Search and rescue operations at the site of the landslide in Dangchang County have concluded; the landslide resulted in 21 fatalities," Xinhua said on Wednesday, citing local authorities.
Authorities have set aside 30 million yuan (US$4.4 million) in reconstruction funds following the landslide.
Natural disasters are common across China, particularly in the summer when some regions experience intense rainfall while others bake in scorching heat.
Tuesday's landslide occurred the same day intense storms and rains in southern and central China killed around 17 people and injured hundreds of others.
