Special purification device for helium compressor with oil piston

The invention relates to the technical field of compressors, and discloses a special purification device for an oiled piston helium compressor, which is characterized in that compressed gas is compressed, oil and moisture are adsorbed onto an oil suction gear by an oil suction part, helium is adsorbed onto the helium suction gear by a rotary meshing mode between the oil suction gear and the helium suction gear, and the helium is adsorbed onto the helium suction gear. High-purity helium is discharged from the first exhaust port, so that the refining purity of the helium is ensured; through connection of the oil absorption cotton and the guide assembly, along with rotation of the oil absorption gear, the oil absorption cotton passes through the oil storage channel, the guide assembly is matched with the trigger assembly to descend, and the oil absorption cotton is ejected out, so that the oil absorption cotton is extruded to deform when passing through the oil storage channel, the extruded oil is in the oil sto