Medical workers carry an injured person out of the rubble of a collapsed restaurant in Linfen, Xiangfen, China. AFP

The number of people killed when a restaurant in northern China collapsed has climbed to 29, state media said Sunday, with efforts to find survivors brought to a close.

The two-storey building in Xiangfen county, Shanxi province, came down on Saturday morning during an 80th birthday party, according to official news agency Xinhua.

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A total of 57 people have been pulled from the debris of the Juxian restaurant, with dozens injured.

Seven people are seriously hurt, although Xinhua said the injuries were "not life-threatening".

Rescue workers are seen at the site where a restaurant collapsed in Xiangfen, China, on Saturday. Reuters

State broadcaster CGTN said the rescue operation ended in the early hours of Sunday morning.

The cause of the collapse is unknown and the central government's State Council said it would supervise an investigation by provincial authorities.

Footage on the CGTN website showed the roof caved in, with rescue equipment lifting rubble from the site.

Rescuers in orange overalls and hard hats combed the crumbled ruin as a painting remained hanging on one of the few walls still intact.

Seven hundred people were involved in the rescue operation, CGTN said.

China is no stranger to building collapses or deadly construction accidents, which are typically blamed on the country's rapid growth that has led to corner-cutting by builders and the widespread flouting of safety rules.

A hotel collapse in southern China's Quanzhou city in March killed 29 people and injured another 42.

An official investigation found three floors had been added illegally to the original four-story structure, and safety assessors had colluded with the hotel's owner to produce false reports about the building, state broadcaster CCTV said.