The invention discloses a soldering tin melting furnace with an automatic feeding device. The soldering tin melting furnace with the automatic feeding device comprises a heat-resisting cavity. A first heating wire is arranged in the heat-resisting cavity. A waste recovering disc is arranged beside the heat-resisting cavity. The soldering tin melting furnace with the automatic feeding device further comprises an automatic feeding device. Due to the fact that the automatic feeding device is adopted, workers are enabled to add soldering tin bars without opening a mesh enclosure, and automatic controlling height of a soldering tin liquid level is achieved, phenomena of too high or too low soldering tin liquid level cannot be caused, and the soldering tin liquid level is constantly maintained at an optimum height.