The invention discloses an automatic soldering tin machine. The automatic soldering tin machine comprises a machine base, a position adjusting device, a welding platform, a wire feeding device, a heating device and a pressure adjusting device; the position adjusting device is arranged on the machine base, the welding platform is arranged on the position adjusting device, the position adjusting device controls the welding platform to move front and back and left and right, the wire feeding device is arranged on the machine base and located above the side of the welding platform, the heating device can be vertically and movably arranged on the machine base and located above the welding platform, the pressure adjusting device can be movably arranged on the machine base vertically, and the pressure adjusting device drives the heating device to vertically move. Semi-automatic tin soldering is achieved through the automatic soldering tin machine, manpower resources are saved, and the product quality and the work efficiency are improved.