The accident happened at around 7:50 AM on a section of the Jiguang Highway in Ningdu County, local authorities said.
There were 44 people including the driver on board the 55-seater vehicle at the time.
The injured have been admitted to hospital, state-run Xinhua news agency reported.
Road accidents are a serious problem in China.
According to World Health Organisation (WHO), more than 250,000 people are killed in road accidents in China.