The invention discloses a unidirectional bearing durance testing machine which comprises a deceleration motor, a crank rocking bar mechanism, a rotary main shaft, a torque limiter, a bearing pedestal and a first driving member. When the unidirectional bearing durance testing machine is in use, a unidirectional bearing is fixed on the bearing pedestal. The bearing inner ring of the unidirectional bearing is fixed on one end of the first driving member, the bearing inner ring is driven by the first driving member to rotate, and the other end of the first driving member is fixed on one end of a torque limiter connecting a working machine. The end of the torque limiter connecting a driving machine is fixed on one end of a rotary main shaft, the other end of the rotary main shaft is vertically fixed on the tail end of the rocking bar of the crank rocking bar mechanism, and the tail end of the crank of the crank rocking bar mechanism is vertically fixed on the rotating shaft of the deceleration motor. The time for testing conventional unidirectional bearing is shortened, and the detection accuracy is improved.