The utility model relates to a power coupling device of an HEV, which is used for achieving reasonable power distribution between two power sources. The power coupling device comprises an engine power input system, a motor power input system and a transmission input shaft, and is characterized in that the engine power input system is provided with an engine power input coupling electromagnet, the motor power input system is provided with a motor power input coupling electromagnet, and the engine power input coupling electromagnet and the motor power input coupling electromagnet are symmetrically arranged and fixedly assembled with the transmission input shaft. The power coupling device of the HEV has the characteristics of high control accuracy and quick response, fuel consumption of the vehicle is reduced, the power performance and the economic performance of the vehicle are improved, the power conversion impact is reduced, and the driving comfort of the whole vehicle is improved.