In order to solve the problem of inconvenient sanitary treatment in outdoor environment, a kind of hand-washing device which can work independently in outdoor environment and can move is designed. The present situation of sanitary treatment is briefly introduced, the advantages and disadvantages of traditional wash-basin are compared and analyzed, the overall design scheme of the device is given, and the theoretical calculation of water supply is carried out. The device can realize the functions of sanitation treatment, recycling of sewage and autonomous positioning and navigation in the process of walking.