Coating additive dropwise adding device

The utility model discloses a coating additive dripping device in the technical field of coatings, which comprises a propelling barrel, a grip is fixedly connected to the bottom of the propelling barrel, a control switch is fixedly connected to the side wall of the top end of one end of the grip, and a discharging end is arranged at one end, close to the control switch, of the propelling barrel. When a coating additive needs to be added, a control switch is pressed, an electric push rod is started to push a push plate to extrude an air bag, at the moment, an air inlet electric control valve is closed, a flow electric control valve is opened, air in the air bag is extruded towards a connecting pipe, and therefore the material storage tank is filled with the air, and the coating additive in the material storage tank is extruded towards an extrusion pipe; and when the control switch is loosened, the flow electric control valve is closed, the air inlet electric control valve is opened, the air bag is inflated whi