The utility model relates to a wash water re -use's municipal road guardrail cleaning device, which comprises a carriage body, install the water pitcher on the automobile body, automobile body one side is fixed with parallel arrangement's an upper fixed plate and bottom plate, it is equipped with the guide bar to rotate between an upper fixed plate and the bottom plate, the guide bar lower part is fixed with the driven gear with guide bar coaxial rotation, automobile body one side is equipped with first motor, be fixed with the first driving gear with a driven gear engaged with on the output shaft of first motor, be fixed with the vertical pneumatic cylinder of arranging on the bottom plate, the pneumatic cylinder upper end is fixed with the sliding plate of cover on the guide bar, the axle sleeve that the level that is fixed with on the sliding plate was arranged, the axle sleeve internal rotation is equipped with the pivot, the one end of being close to the guide bar in the pivot is fixed with the 2nd driven gear, the other end of pivot is fixed with the mounting panel that the level was arranged, the mounting panel below is fixed with road guardrail cleaning device and washs water recovery unit. The utility model discloses degree of automation and operating efficiency are high, save the manual work, and the security is good, convenient operation.