Box welding system

The utility model discloses a box welding system which comprises a welding workshop, a conveying line, an electric roller shutter door, a welding robot, a positioning and clamping mechanism and a control cabinet. The electric roller shutter door comprises a roller shutter box installed on the welding workshop, a roller shutter shaft driven by a roller shutter motor is arranged in the roller shutter box, and a roller shutter is installed on the roller shutter shaft. The positioning and clamping mechanism comprises a first sliding rail, a second sliding rail installed on the first sliding rail through a sliding block, a box pushing arm installed on the second sliding rail through a sliding block and an electric lead screw driving the sliding block to slide. The conveying line is driven by a conveying motor, and a box body sensor controlled by a control cabinet is arranged on the conveying line. According to the automatic welding machine, the conveying line is used for inputting and outputting the box body, the