Cleaning device for side guardrail of expressway

An expressway side guardrail cleaning device comprises a mechanical arm, two cleaning panels and a position adjusting assembly connected between the mechanical arm and the two cleaning panels. The position adjusting assembly is used for adjusting the horizontal position and the vertical position of the two cleaning panels and comprises a vertical air cylinder, a supporting part, a horizontal air cylinder and two clamping arms, and the bottoms of the clamping arms are connected and fixed to the tops of the cleaning panels through bolts; the cleaning panel comprises a cleaning frame, a cleaning brush head and a wiping rag, the cleaning brush head and the wiping rag are mounted on the cleaning frame, the cleaning brush head comprises a cleaning base and bristles arranged on the outer side of the cleaning base, and a plurality of cleaning nozzles are arranged on the inner side of the cleaning base and correspond to the water spraying holes. The highway guardrail cleaning device solves the problem that an existing