The invention discloses an automatic welding machine, and belongs to the technical field of automatic welding. The automatic welding machine comprises a control box body, a feeding part, an overturning and turning-around part, a three-axis platform, a welding gun adjusting part, a tin feeding part, a welding gun welding part, a temperature controller and a discharging part. The feeding part is connected with the overturning and turning-around part through an arranged conveying belt and is used for conveying a jig to a feeding port, a sensor and a pushing rod are arranged at the feeding port, and when the sensor senses a material, the pushing rod pushes the material into the overturning and turning-around part; the automatic feeding is carried out through the feeding part, the automatic overturning and turning-around is realized through the overturning and turning-around part, the automatic tin feeding is realized through the tin feeding part, and the temperature control digital displayfunction is achieved through the temperature controller; according to a time relay, a welding timing function, a tin feeding state detection function, a digital display controller control function, and a multi-axis linkage function of the three-axis platform are realized; and a welding gun is adjusted through the welding gun adjusting device; and therefore, the welding precision is higher; and meanwhile, the automatic working processes are adopted for the whole process, so that the automation degree is higher.