Modularized variable fertilizer discharging device

The utility model provides a modularized variable fertilizer feeding device, which comprises a fertilizer opening degree adjusting part, a fertilizer feeding rotating speed adjusting part and a fertilizer feeder, the fertilizer opening degree adjusting part comprises a fertilizer opening motor, a gear is fixed on an output shaft of the fertilizer opening motor, the gear is meshed with a rack, the rack is connected with a fertilizer opening degree baffle plate, the fertilizer feeding rotating speed adjusting part comprises a fertilizer feeding motor, and the fertilizer feeding rotating speed adjusting part is connected with the fertilizer feeder. The fertilizer discharging motor is connected with the fertilizer discharging shaft, the fertilizer discharging shaft is fixedly provided with the fertilizer discharging groove, the fertilizer discharging groove is located between a fertilizer falling opening and a fertilizer discharging opening of the fertilizer discharging device, the fertilizer opening opening baff