Automatic maintenance device for bridge guardrail

The utility model relates to a bridge guardrail maintenance tool, in particular to an automatic maintenance device for a bridge guardrail, which is characterized in that a walking device comprises a frame, a transmission shaft is arranged at the bottom of the frame, the transmission shaft is arranged in the middle of the frame and rotatably connected onto a supporting seat, wheels are fixedly connected to two ends of the transmission shaft, and the top end of the supporting seat is fixedly connected to the bottom of the frame; a motor is fixedly connected to the frame, the output end of the motor is connected with a transmission shaft through a gear toothed belt, two universal wheels are arranged at the bottom of the frame and arranged on the two sides of the wheels, the spraying device comprises a support, the support is fixedly connected to the upper portion of the frame, a water tank is fixedly connected to the upper portion of the support, and the motor is arranged below the water tank. The water pump is