Cleaning device based on municipal engineering highway guardrail cleaning machine

The utility model belongs to the field of municipal engineering, and particularly relates to a cleaning device based on a municipal engineering high-speed guardrail cleaning machine, which comprises a cleaning roller, a motor used for driving the cleaning roller to rotate and a support assembly used for installing the cleaning roller and the motor, the brush needle comprises a pipe body fixedly connected with the cleaning roller and a needle body inserted into the pipe body in a sliding manner, and a spring for providing elastic force for the needle body is arranged in the pipe body; and when the needle body is pressed, the needle body can be retracted into the tube body, so that the length of the brush needle is reduced. When the needle body is used for scraping and washing a guardrail, the needle body can retract along with the surface shape of the guardrail, so that the shape formed by the outer ends of all the needle bodies can be matched with the surface shape of the guardrail during use, and the needle