The invention relates to a tin soldering machine which comprises a rack, a soldering mechanism and tin wire feeding mechanisms. The soldering mechanism is installed on the rack and comprises electric soldering iron soldering assemblies, a vertical driving assembly and a horizontal driving assembly. The electric soldering iron soldering assemblies can be used for carrying out tin soldering on a workpiece and are installed on the vertical driving assembly. The vertical driving assembly can drive the electric soldering iron soldering assemblies to vertically move. The horizontal driving assembly is installed on the rack, and the vertical driving assembly is installed on the horizontal driving assembly. The horizontal driving assembly can drive the vertical driving assembly to slide horizontally. The tin wire feeding mechanisms are arranged on the rack and used for providing tin wires for the electric soldering iron soldering assemblies. According to the tin soldering machine, automatic tin feeding can be achieved through the tin wire feeding mechanisms, the tin wires and the workpiece can be automatically soldered through the soldering mechanism, the automatic tin soldering process is achieved under the coordination of the soldering mechanism and the tin feeding mechanisms, the tin soldering machine is combined with a production line to achieve automatic control, and the tin soldering efficiency and the soldering quality are improved.