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Aiming at the problems of high humidity, poor fluidity, and difficulty in applying powder organic fertilizer, a powder organic fertilizer discharging device was designed. The device was mainly composed of a fertilizer box, a fertilizer discharging wheel, an anti-free-flow baffle and a fertilizer discharging shaft. In order to improve the applicability of the fertilizer distributor, the powder organic fertilizer with different moisture content ((28±1)%, (32±1)%, (36±1)%) was used as the research object to design the fertilizer distributor. The mechanical analysis of the organic fertilizer during the driving process of the fertilizer discharging wheel was carried out, and the wheel was designed into a cycloidal shape. In order to prevent the organic fertilizer from passing through the fertilizer outlet directly on the bottom of the fertilizer tank to produce self-flow phenomenon, and break the agglomerated organic fertilizer, an anti-free-flow baffle was designed. Taking the number of fertilizer discharging finger and the width of the fertilizer outlet as the experimental factors, and coefficient of variation of fertilization stability as the performance index, the quadratic orthogonal rotation combination experiment was carried out to establish the discrete element simulation model of the fertilizer distribution. The fertilization stability was the best when the number of fertilizer discharging finger was 6 and the width of the fertilizer outlet was 36.36mm. The performance test of the designed fertilizer distribution was carried out with the cutting down rate, coefficient of variation of fertilization consistency of each row, coefficient of variation of fertilization stability and coefficient of variation of fertilization uniformity as the evaluation index. It was showed that when the designed fertilizer distribution applied the organic fertilizer with different moisture contents at a speed of 5~8km/h, each performance index was within the specified range, and the working performance was stable, which can meet the technical requirements.