The invention discloses a power coupler for a hybrid power automobile and an operation mode of the power coupler. The power coupler comprises an engine, a first planetary line, a second planetary line, a first motor, a second motor and a power battery. The first motor and the second motor are connected with the power battery, a first clutch and a first brake are arranged between the engine and thefirst planetary line, and a second brake is arranged between the first planetary line and the second motor. The first planetary line is connected with the second planetary line through an outer gearring driving wheel, and the second planetary line is connected with a differential mechanism through a gear set. The power coupler is compact in structure and high in integration degree, a plurality of working modes can be achieved through different control strategies, and thus the dynamic property and the economic property of the automobile can be improved.