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The application provides an automatic pin type arc welding device, which comprises a handheld welding gun and an external device, the handheld welding gun is provided with a shell, one end of the shell is provided with a first clamping groove, an electromagnet lifting assembly is arranged, the electromagnet is provided with an iron core, the other end of the electromagnet is provided with a spring, one end of a first pneumatic assembly is provided with a linear bearing, a distribution assembly is arranged, the distribution assembly is provided with a connecting pipe, one side of the connecting pipe is provided with a notch, the notch is provided with a connecting sleeve, the upper side of the connecting sleeve is provided with a first feeding pipe, and the first feeding pipe, the connecting pipe and the connecting sleeve are communicated. The automatic pin type arc welding device is used, continuous automatic supply and welding of the pin are realized, the welding rhythm is doubled compared with the traditional manual operation, and the production efficiency and the automation level of the pin welding of the inner wall of the boiler are significantly improved.