Anti-fouling positioning device for through-wall switch box

The utility model discloses an antifouling positioning device for a through-wall switch box, which relates to the field of switch box accessories and comprises a positioning bottom box used for positioning the switch box when a wall body is poured and a positioning lengthening box used for preventing dust and fouling. The outer wall of the bottom of the positioning bottom box is provided with a fixing gasket used for being externally connected with a junction box bottom box fixing seat. And the positioning bottom box is connected with the positioning lengthening box. In the prefabricated building pouring process, the fixing gasket and the positioning bottom box are matched with each other to achieve accurate pre-embedded positioning of the mounting position of the switch box, mortar is prevented from entering the switch box under the cooperation of the positioning lengthening box, the positioning lengthening box prevents a plaster layer from entering the switch box in the plastering process, and the mounting