The invention discloses a plug 
welding machine. The plug 
welding machine comprises an eight-
station welding table, a body feeding mechanism, a first 
weld line feeding mechanism, a first 
servo welding mechanism, a first image detecting device, a 
servo repairing welding mechanism, a second 
weld line feeding mechanism, a second 
servo welding mechanism, a second image detecting device, a finished product 
discharge mechanism, an electric cabinet, a human-
machine controller and a regional security 
grating which are all arranged on a 
factory floor; the body feeding mechanism, the first 
weld line feeding mechanism, the first servo welding mechanism, the first image detecting device, the servo repairing welding mechanism, the second weld line feeding mechanism, the second servo welding mechanism and the finished product 
discharge mechanism are distributed sequentially on each 
station of the eight-
station welding table; the second image detecting device and the second servo welding mechanism are arranged on the same station of the eight-station welding table. By utilizing the above manner, the assembling welding efficiency is high, the production stability is attractive, the product 
rejection rate is low, and the total production efficiency is high.