This invention proposes a hybrid power driving device including an electric motor, an Internal Combustion engine, an automated mechanical transmission, a clutch, a main reducer and a differential, where the automated mechanical transmission includes first to sixth gear wheels forming meshing pairs, 2 synchronizers, an input transmission shaft connected with the engine, an input transmission shaft connected with the motor, and an output transmission shaft. This device provides for the motor with two gears, and provides for the engine with four gears, which can meet the practical demands of the engine and the motor. Compared with the existing parallel hybrid power coupling mechanism, the inventive device has a simple structure, a low cost, good shifting comfortability, and a high operation efficiency.