Environment-friendly smoke exhaust device of coating machine

The utility model provides an environment-friendly smoke exhaust device of a coating machine, which comprises a smoke exhaust fan, a connecting pipe is vertically arranged at an outlet at the upper end of the smoke exhaust fan, a smoke exhaust pipe is vertically arranged above the connecting pipe, the lower end of the smoke exhaust pipe is arranged around the upper end of the connecting pipe, a distance exists between the inner wall of the smoke exhaust pipe and the outer wall of the connecting pipe, and a water-cooled heat exchanger is arranged around the outer side of the smoke exhaust pipe. A connecting flange is arranged at the upper end of the smoke exhaust pipe, the upper end of the smoke exhaust pipe is connected with the main pipeline through the connecting flange, a shell is arranged on the outer side of the smoke exhaust fan, an oil receiving box is arranged at the upper end of the shell, an oil receiving disc is arranged above the oil receiving box, the oil receiving disc is arranged around the out