Weichai Power Company Limited or Weichai Power , by Weifang Diesel Engine Factory is the state-owned enterprise in Weifang, Shandong, China, specializing in the research and development, manufacturing and sales of diesel engines. The products are used in vehicles, vessels and power generators. It is the largest car accessories enterprise in China.
Weichai's H share was listed on the Hong Kong Stock Exchange in 2004 and its A share was listed on the Shanghai Stock Exchange in 2006. It is the first Hong Kong's H share to be listed on China's A share market.
Weichai was the subsidiary company of Sinotruk, but they split off and became competitors in 2006. They also involved a patent dispute on Weichai's diesel engine splitters used by Sinotruk.