The invention discloses a paint coating device having a quick drying function and applied to chain machining. The paint coating device comprises a box body, a chain body, a second connecting pipe anda third connecting pipe; a first connecting pipe is fixedly installed at the internal bottom end of the box body; the lower end of the first connecting pipe is in threaded connection with a hose; thefirst connecting pipe is positioned above a horizontal plate; the lower end of an electric telescopic rod is connected to the upper surface of a bearing plate in a welding way; the chain body is positioned under the bearing plate; an air guide groove is formed inside a drying box; a circuit board is fixedly installed at the right end of a heating wire; the second connecting pipe is connected inside a coating plate in a penetrating manner; the third connecting pipe is movably connected to the front end of the second connecting pipe; and a sealing gasket is arranged at a contact position of thethird connecting pipe and the second connecting pipe. The paint coating device having the quick drying function and applied to chain machining can realize quick drying of a paint, can realize collection of redundant paint liquid and makes the paint be coated uniformly enough.