Crankcase body of air compressor

The invention belongs to the technical field of air compressors, and particularly relates to an air compressor crankcase body which comprises a machine shell, a machine cover is mounted at one end of the machine shell, a crankcase is mounted at the other end of the machine shell, through holes are formed in the top and the bottom of the crankcase, and a crankshaft cover is mounted on the through hole in the top. By arranging the collecting device, when the piston moves upwards, the air pressure in the crankcase is reduced, at the moment, external air can enter the space at the bottom of the soft iron sheet through the air hole, so that the soft iron sheet protrudes upwards, and the piston plate and the pipe cover can move upwards along with the piston; when a crank shaft is damaged, a gap between the pipe cover and the second funnel cover is gradually closed, at the moment, the broken connecting piece in the storage box can be limited in the storage box under the action of the pipe cover and the second funnel