This invention discloses one automatic gear box key part oil pump test bench, which is characterized by the following parts: test bench body composed of drive elevator cylinder, oil pump drive motor, oil pump gas and liquid clamping device, tested oil pump socket, moving workbench, oil storage box, oil cooling device and automatic gate. The invention is characterized by the following: a, belonging to the electrical, gas and liquid integration and computer control technique; b, the oil pump input axis motor adopts gas driven hydraulic elevator; c, the motor accurately connects to the gas or liquid driven workbench level and vertical axis through elastic axis; d, automatic test process; e, adopting integration oil technique.