Plastic ton barrel top cover with exhaust structure

The utility model relates to the technical field of plastic ton barrel structures, in particular to a plastic ton barrel top cover with an exhaust structure, which comprises a frame body, the frame body comprises a base, stand columns are connected to four corners of the top end of the base, a plurality of sleeve frames are connected to the inner sides of the stand columns at equal intervals, and a ton barrel body is placed at the top end of the base. An exhaust cover is arranged at the top end of the ton barrel body and comprises a sealing cover arranged at the top end of the ton barrel body in a threaded and sleeving mode, a groove is formed in the top end of the sealing cover, air holes are formed in the inner wall of the groove, and a blocking cover is embedded in the groove of the sealing cover. Gas generated by liquid volatilization pushes the blocking cover through the air holes of the sealing cover, the bottom end of the blocking cover moves upwards under the thrust action of air pressure, then a gap