The invention relates to a three-motor hybrid drive truck and a power system parameter matching method. The three-motor hybrid drive truck is composed of a first drive motor, a first input shaft, a first reducer, a first output shaft, a vehicle front axle, a second input shaft, a second drive motor, a first power battery, a second The power battery, the third drive motor, the third input shaft, the rear axle of the vehicle, the second output shaft, the second reducer, the third power battery, the controller and the fourth power battery are assembled and constituted; the parameter matching of the power system in the present invention In the process, the parameter matching method of the first drive motor, the second drive motor, the third drive motor and the reducer of the three-motor hybrid drive truck is given, which provides a theoretical basis for the development of the power system of the three-motor hybrid drive truck. . The invention can reduce the capacity of the driving motor, the difficulty of motor manufacture, and reduce the cost, and at the same time, through the reasonable matching of the powers of the three motors, the power and economy of the whole vehicle can be significantly improved.