Fertilizer feeding shaft and fertilizer feeding device of corn planter

The utility model relates to the field of agricultural machinery, in particular to a fertilizer feeding shaft and a fertilizer feeding device of a corn planter. A fertilizer feeding shaft of a corn planter is characterized by comprising a fertilizer feeding grooved wheel provided with fertilizer feeding teeth; the discharging shaft is positioned in the axis direction of the fertilizer discharging groove wheel and is integrated with the fertilizer discharging groove wheel; discharging grooves are formed in the outer circumferential faces of the two ends of the discharging shaft and spirally distributed in the discharging shaft, and openings of the discharging grooves are gradually increased from the ends, close to the fertilizer discharging grooved wheel, of the discharging grooves to the other ends of the discharging grooves so that fertilizer powder can be discharged. The designed discharging shaft is provided with a spiral groove, so that fertilizer powder between the discharging shaft and the shaft sleeve