The utility model relates to a filling nozzle of a hot melt gun for injection molding. The utility model avoids that the accidents of the hot melt gun are caused by the refluxing of glue solution when the opening of the filling nozzle is clogged. A through hole which is arranged in the filling nozzle penetrates through the front and the back ends of the filling nozzle, and the front end of the filling nozzle is provided with more than one spillway which is communicated with the through hole. The spillway can be a slot or a through hole. The utility model is used for the hot melt gun.