Abstract: The turnover of hydraulic hinge is an important part of assembly thereof. At present, due to the lack of corresponding turnover mechanism to realize the automatic turnover of hydraulic hinge, a kind of hydraulic hinge turnover mechanism is designed to realize the automation of its assembly. This paper mainly describes the working principle of the mechanism and the design of the mechanical structure. The mechanism is mainly composed of feeding mechanism, rotating mechanism and feeding mechanism. The hydraulic hinge can be clamped from the fixture block before turning, 180° turning, and placed on the fixture after turning. It has characteristics of simple structure, stable work and high turnover efficiency. Now the mechanism has been applied to the developed hydraulic hinge automatic assembly line, which has a certain reference value for solving the turnover problem of small workpieces.