The utility model relates to a but self -cleaning window glass's detecting device, including the detecting device body, the detecting device body is including shell and upper cover, shell and upper cover in the distolateral swing joint in back, be equipped with in the shell main control board and with the video acquisition unit that the main control board is connected, video acquisition unit's front end be equipped with window glass, one side of window glass is equipped with the electromotion glass cleaner, the bottom of shell is equipped with and can be used to the spray tube jet -propelled and hydrojet, the mouth of pipe of spray tube is directional window glass, the spray tube passes through diverter valve connecting pipe and cleaning solution pipe, the trachea is connected the air pump respectively and is placed the clean liquid pump in the cleaning solution container in with the cleaning solution pipe. The utility model discloses can realize jet -propelled cleanness, spout electromotion glass cleaner cleanness for the cleaning solution, can guarantee window glass's cleanliness to detecting device's normal image acquisition work has been guaranteed.