Workpiece flipping equipment is widely used in hexagon workpiece multi face and work station processing. Hydraulic drive has advantages of easy linear motion achivement, high power quality ratio and rapid dynamic response, etc. It is an essential element of modern mechanical engineering and one of the key technologies of engineering controls. Hydraulic drive system of the hexagon workpiece flipping equipment was designed, the hydraulic system schematic was drawn, its working principle was analysed. The workpiece flipping was successfully achieved by using hydraulic technology, it obtained good results in practical applications.