The invention relates to a device for testing the performance of a wheelchair driving brake, and belongs to the technical field of brake performance testing. The device comprises a test platform frame, a test platform, a digital display angle measuring instrument, an ultrasonic baffle plate, an air spring, a triangular supporting frame of the air spring, a wheelchair to be tested and an ultrasonic range finder, and is characterized in that the test platform is connected with the bottom of the test platform frame through a rotating shaft, the digital display angle measuring instrument is fixed at the bottom of the test platform frame, the ultrasonic baffle plate is arranged at the bottom end of the test platform, the front part of the test platform is connected with the test platform frame through the air spring and the triangular supporting frame thereof, and the ultrasonic range finger can be fixed on the wheelchair. The device can complete performance testing for the wheelchair driving brake according to requirements of the national standard.