Automatic dewatering system for foundation pit

The utility model discloses an automatic dewatering system for a foundation pit. The automatic dewatering system comprises a supporting device, a rotating motor, a water level detection device, a drainage device and a controller. The supporting device comprises supports arranged on the two sides of the dewatering well, rotating shafts arranged on the supports, winding drums arranged on the rotating shafts and lifting ropes. One end of the lifting rope is wound on the winding drum, and the other end extends into the dewatering well. The water level detection device comprises a shell, and an illuminating lamp, a water level detector and an image acquisition device which are arranged in the shell. According to the automatic dewatering system for the foundation pit, the water level height in the dewatering well can be monitored, after the water level height exceeds a set value, the controller controls the water pump to pump water, the water surface environment can be known by arranging the illuminating lamp and t