Structure of air suction seed metering device. (a) Seed meter exploded view. (b) Seed meter combination view. (1) Shell of seed meter. (2) Disk drive. (3) Bearing. (4) Guide groove plate fixing device. (5) Guide groove plate. (6) Air suction plate. (7) Forced seeding plate. (8) Storage seed shell. (9) Vacuum fan. (10) Three-way switching device. (11) Aid seed funnel. (12) Waste seed recovery device. (13) Air pump.