The utility model relates to an electric wheel chair retrodisplacement proof device, which belongs to the technical field of manufacture of electric wheel chairs. The utility model is characterized in that the utility model is composed of a supporting bar (1), one end of which is provided with a universal fork (2), a small wheel (3) which is arranged on the universal fork, etc., wherein, the universal fork is connected with the supporting bar by a screw (4). The utility model has the advantage of reasonable design; the utility model is used as an auxiliary device for the electric wheel chair and is arranged on the electric wheel chair; when the wheel chair is inclined backwards to a certain degree, the small wheel can be in contact with the ground to support the wheel chair, which can avoid the electric wheelchair from turning backwards. The running safety can be raised.