Bridge anti-collision guardrail spraying maintenance device

The utility model belongs to the technical field of bridge structure maintenance, and solves the problems that the operation process is relatively tedious and the maintenance efficiency is low when a water storage tank of an existing bridge anti-collision guardrail spraying device does not have water. According to the bridge anti-collision guardrail spraying maintenance device, a water storage tank is fixed to the upper end of a bearing frame, a spraying pipeline is led out of the water storage tank and arranged along the bearing frame, a PLC is connected with a water pump used for controlling spraying of the spraying pipeline and a driving motor used for controlling walking wheels, and a water level sensor connected with the PLC is arranged in the water storage tank; when the water level sensor detects that the water level of the water storage tank is lower than a preset low water level line, the PLC controls the driving motor to rotate reversely so that the device can automatically return to a starting poin