The invention discloses a fuel battery automobile power assembly integrated test system. The fuel battery automobile power assembly integrated test system comprises a fuel battery car power subsystem, a DC/DC converter, a DC/DC controller, an environment and load simulation subsystem, and a control subsystem; the fuel battery car power subsystem comprises a driving motor, a driving motor controller, a gearbox, a gearbox controller, a main speed reducer, a fuel battery engine, a fuel battery engine controller, a power storage battery and a power storage battery controller; the environment and load simulation subsystem comprises a temperature environment controller, mechanic vibration environment controller, a power measurement machine, a power measurement machine controller and a torque rotation speed sensor; the power measurement machine, the torque rotation speed sensor, the main speed reducer, the gearbox and the driving motor are successively connected; the control subsystem performs communication with the fuel battery car power subsystem and the environment and load simulation subsystem through a bus communication network, stores uploaded testing data and controls to finish testing tasks. Compared with the prior art, the fuel battery automobile power assembly integrated test system can perform parallel testing through multiple tasks and has high instantaneity.