Tray seeder with self-cleaning suction nozzles

The invention discloses a tray seeder with self-cleaning suction nozzles. The tray seeder comprises a frame unit, a holing system unit, a seeding system unit and a control system unit, wherein a conveyer belt transmission device pulled by a stepping motor is arranged on an upper end face of the frame unit; the holing system unit is provided with a holing supporting beam which stretches across frame main girders; a group of holing heads are arranged on each row of holing beam; a seeding beam connecting rod is fixed between a pair of swing arms of a swing mechanism of the seeding system unit; at least one row of seeding beams are fixed on the seeding beam connecting rod; a row of self-cleaning suction nozzles are arranged on the lower side of each row of seeding beam; a vibrating seed tray for accommodating seeds is arranged below the self-cleaning suction nozzles; the control system unit comprises a control box, a group of air-operated solenoid valve components, a group of photoelectric sensors, photoelectric sensor reflectors matched with the photoelectric sensors, and a sensor contact block fixed on a swing shaft of the seeding system unit; and the control system unit controls the start/stop of electric parts of each unit. By the tray seeder, the seeding efficiency and seeding precision can be improved, and high quality and high yield of seedlings are guaranteed.