The invention discloses a school bus overmaning-prevention automatic control system which comprises an infrared detection device, an overmaning recognition control module, a wheel speed sensor, a display module, a voice alarm module and a loading limiting door hurdle. The school bus overmaning-prevention automatic control system is characterized in that the infrared detection device is installed at a passenger taking door of a school bus and used for recognizing the number of passengers, the wheel speed sensor is installed on a driving axle shell of the school bus and used for judging whether the school bus travels or not, the display module is a character display device and located on an LED display screen on one side of the right front portion in a carriage of the school bus, the voice alarm module is an audible alarm device and installed on the upper portion of an instrument panel, the loading limiting door hurtle is a taking limiting device and installed at the door of the school bus, and the infrared detection device, the wheel speed sensor, the display module, the voice alarm module and the loading limiting door hurdle are connected with the overmaning recognition control module. The school bus overmaning-prevention automatic control system is used in the school bus and can automatically control overmaning of the school bus.