Greenhouse asparagus fertilizing device and method

The invention discloses a greenhouse asparagus fertilizing device and method. The greenhouse asparagus fertilizing device comprises a driving screw rod, screw rod bases, fixed lug pieces, driving motors, translation shells, a fertilizer box, connecting rods and a fertilizing box, wherein the fertilizer box and the fertilizing box are connected through the connecting rods and integrally mounted inswinging shafts of the translation shells; when the driving motors are started, the translation shells, together with the fertilizer box and the fertilizing box, reciprocate on the driving screw rod;when swing motors are started, the swinging shafts drives the fertilizer box and the fertilizing box to swing front and back; when a centrifugal motor is started, water introduced by an external waterpipe is fully mixed with a fertilizer in a centrifugal sleeve drum, and fertilizer water is then thrown out from the centrifugal sleeve drum under a centrifugal action and flows into the fertilizingbox from a water leakage ope