The invention discloses a bus passenger door safety device. The bus passenger door safety device comprises a rotating shaft, a crank, a long key, a tension spring, a box body, a long baffle, a drivingbaffle, a motor, a return spring, a bolt and a shell. The bus passenger door safety device is characterized in that the crank is fixed to the rotating shaft by the long key; the box body is connectedwith the rotating shaft in a threaded mode; the long key compresses the long baffle under the action of the tension spring; one end of the long baffle is extruded by the return spring, and the otherend of the long baffle is fixed by the driving baffle; and the driving baffle is controlled by the motor. The bus passenger door safety device is simple in structure and easy to realize, separation between an air cylinder and the rotating shaft can be achieved by achieving separation between the crank and the rotating shaft, and high practical value is achieved.