The invention relates to the technical field of capacitor production equipment, in particular to a full-automatic welding machine. The full-automatic welding machine comprises a main base. An upper welding mechanism is installed on the upper portion of the front end face of the main base. A lower welding mechanism and a guide pin righting mechanism are installed on the lower portion of the front end face of the main base. The upper welding mechanism comprises an upper welding installation base installed on the upper portion of the front end face of the main base, an upper welding sliding assembly installed at the front end of the upper welding installation base, a welding wheel installation assembly, a welding following assembly, an upper welding adjustment assembly and a welding swinging assembly installed on the upper portion of the upper welding installation base. The lower welding mechanism comprises a lower welding installation base installed on the lower portion of the front end face of the main base, a lower welding pin assembly and a lower welding swinging assembly. The guide pin righting mechanism comprises a righting slide block assembly and a guide pin clamping assembly which are installed at the front end of the main base. The guide pin clamping mechanism is provided with a left guide pin clamp and a right guide pin clamp which are symmetrically arranged. A pin pressing arm is arranged in front of a welding wheel. Three mechanisms are all provided with the accurate positioning assemblies, the welding strength can be adjusted, and therefore the welding stability and the consistency of welded products are improved.