Waste gas purifying and circulating device of setting machine

A waste gas purification circulating device of a setting machine belongs to the technical field of waste gas treatment equipment. Comprising an outer cover body, an air inlet is formed in the bottom of the outer cover body, an annular bottom liquid collecting hopper is arranged at the bottom of an inner cavity of the outer cover body, an inner ring of the bottom liquid collecting hopper is arranged around the top of the air inlet, and a smoke-proof cover is arranged at the top of the bottom liquid collecting hopper; the gas inlet is formed in the bottom of the outer cover body, can be connected with a waste gas ejector pipe for centralized treatment in a sleeving mode and is arranged in a circular ring shape, so that gas leakage can be avoided, the gas treatment effect of the interior is greatly improved, meanwhile, the liquid spraying device for spraying liquid is arranged in the outer cover body, and the waste gas treatment effect is greatly improved. Liquid located in the bottom liquid collecting hopper ca