Medical bed horizontal driving mechanism, medical bed horizontal driving system and medical bed

A medical bed horizontal driving mechanism comprises a support (10), a roller (20), a motor (30) and a position sensor (41). The support is used for being fixedly connected with a bed frame (91) of the medical bed. The roller is rotatably connected with the support. The roller can drive a bed board (92) of the medical bed to move relative to the bed frame through rotation. And the motor is arranged in a roller cavity of the roller. A shell of the motor is fixedly connected with the support. An output shaft of the motor is connected with the roller to drive the roller to rotate relative to the support. The position sensor is arranged in a roller cavity of the roller. The position sensor can detect the rotating position of the roller and generate a position signal, and the position signal is used for controlling the motor. The horizontal driving mechanism of the medical bed is convenient to install and maintain, and space is saved. In addition, the invention further provides a medical bed horizontal driving sys