The invention relates to the technical field of detection equipment, particularly provides a backstop automatic performance testing machine, and especially provides a backstop performance testing machine which can automatically complete no-load resistance moment, temperature rise test and backstop performance endurance test of the backstop. The testing machine comprises a mechanical platform whichis provided with a vertical installing frame and a backstop loading oil cylinder which is slidably installed on the side surface of the vertical installing frame. The top part of the backstop loadingoil cylinder is provided with a pull pressure sensor. The vertical installing frame is coaxially provided with a fixed external circle, a rotating internal circle, a test piece installing disc and acore shaft which are arranged from outside to inside. The fixed external circle and the rotating internal circle are provided with a circle of square through holes. The rear side of the fixed externalcircle is provided with at least one rectangular square pin which is driven by the oil cylinder and can be inserted into the square through holes. The middle part of the core shaft is connected witha separated device through a spline for transmission with the rotating internal circle and the test piece installing disc. The rear end of the core shaft is engaged with the output gear of a transmission device through a transmission gear. One end of the rotating shaft of the input gear of the transmission device is provided with a torque sensor and a variable frequency motor, and the other end isconnected with a servo motor through an overrun clutch.