Automatic welding back gas protection device

The utility model relates to the field of plasma automatic welding protection adopted by austenitic stainless steel in the chemical industry, in particular to an automatic welding back gas protection device which comprises a gas collection chamber, and an opening is formed in one end of the gas collection chamber. The other corresponding end of the base plate is fixedly connected with a rotating bottom plate through an elastic pressing device, and the rotating bottom plate is connected with a driving device for driving the rotating bottom plate to move; a jacket type water cooling box is fixedly arranged outside the gas collecting chamber, a water feeding opening is formed in one side of the jacket type water cooling box, and a water discharging opening is formed in the other corresponding side of the jacket type water cooling box. By means of successful development of the automatic welding device, production requirements on operability are met, meanwhile, working efficiency is improved, and labor cost of wel