Abstract: A medical bed horizontal driving mechanism includes a bracket, a drum, an electric motor, and a position sensor. The bracket is configured to be fixedly connected to a bed frame of a medical bed. The drum is rotatably connected to the bracket. The drum is rotatable to drive a bed board of the medical bed to move relative to the bed frame. The electric motor is arranged in a cavity of the drum. A housing of the electric motor is fixedly connected to the bracket. An output shaft of the electric motor is connected to the drum to drive the drum to rotate relative to the bracket. The position sensor is arranged in the cavity of the drum. The position sensor can detect a rotational position of the drum and generate a position signal, which is used to control the electric motor.