The invention discloses an automatic urban road washing device, and belongs to the field of environment protection. The automatic urban road washing device achieves the technical purposes of changing the traditional method that urban road washing work is mainly conducted through people or machines, improving work efficiency, and achieving the aims of automatically eliminating road pollution and keeping roads clean and tidy. The automatic urban road washing device structurally comprises a high pressure water pump, a water pipe, spray nozzles, a sewage drainage opening, a sewage drainage pipe, a water storage pool and the like. According to the work principle, water in the water storage pool is conveyed to the spray nozzles through the water pipe by means of the high pressure water pump and sprayed on the road surface through the spray nozzles to clean the road surface so that dust and other dirt on the road surface can be washed away to the sewage drainage opening in the roadside and discharged into the water storage pool through the sewage drainage pipe, the aim of cleaning the road surface is achieved, and the road surface is kept clean, tidy and free of pollution. The water used for cleaning is mainly obtained by collecting rainwater on the road surface, other water sources supplement the water used for cleaning, and the water can be recycled. The technology plays a great role in reducing raised dust on the road surface, preventing air pollution, beautifying the environment and improving urban air quality.