The invention provides a hybrid power vehicle driving device and a control method thereof, belonging to the technical field of locomotives, and solving the problem of improving the power transmission efficiency. The device comprises an engine, an output chain, a control module, a primary transmission mechanism, a final transmission mechanism, a planetary mechanism as well as a motor 1 and a motor 2 which are capable of adjusting and switching the functions of a generator and an electric motor according to the control module, wherein the motor 1 is in axis connection with the engine, the engine is connected with the planetary mechanism through the primary transmission mechanism, the motor 2 is in axis connection with the planetary mechanism, the planetary mechanism is connected with the output chain, and the control module is electrically connected with the motor 1, the motor 2 and the engine. The method comprises the following steps: A, receiving a throttle opening signal in real time, and outputting a rotation speed signal; B, determining the working modes of the motor 1, the motor 2 and the engine according to the current running state of a vehicle; and C, calculating and outputting a control instruction according to the relation between the rotation speed and torque. The device and method provided by the invention achieve the purpose that the engine always works at a good rotation speed and in a good load state.