The new company will be named Quingdao Qiyao Wartsila MHI Linshan Marine Diesel Company.
Production is set to start during the fourth quarter of 2008.
The deal was examined under the EU's 'simplified' merger review procedure, for cases which the commission believes do not pose competition concerns.
China Shipbuilding produces ships and is active in marine equipment engineering, designing and manufacturing.
Wartsila is a ship power supplier and global service network operator, while Mitsubishi is a heavy machinery manufacturer.