Air suction type precision seed-metering roller for charging seeds by air blowing

The invention discloses an air suction type precision seed-metering roller for charging seeds by air blowing. The air suction type precision seed-metering roller comprises a roller hollow shaft, an absolute pressure separation device, a rapid connector, a sealing ring, a roller subjected to half-sectioned machining and the like, wherein a tapered through hole is formed in the roller; the roller hollow shaft is welded with the absolute pressure separation device to form a whole body through a hanging part; one end of the roller hollow shaft is connected with negative-pressure gas and is communicated with the inner part of the roller; the other end of the roller hollow shaft is connected with positive-pressure gas and is in sealed connection with the inner end of the roller; a small hole for connecting the rapid connector is formed in the other end of the roller hollow shaft and the other end of the roller hollow shaft is communicated with the absolute pressure separation device through the rapid connector and