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The technology of deep mechanical fertilization in paddy field has been developed rapidly as the research and development of special fertilizer for paddy field mechanical fertilization was mature. But the uniformity of mechanical fertilization in paddy field was poor at present, some phenomenon was still exist such as fertilizer bonding, overhead, ditcher blocked during the operating at the end of the furrow opener. In view of the current problems, a mechanical forced fertilizer discharging device adopted with the principle of screw auger forced transportation for paddy field was innovatively designed, and structural design and performance test of key components combined with the agronomic characteristics of paddy field mechanical fertilizer application were carried out. The working process of the forced fertilizer component was divided into three stages. The status of fertilizers in the spiral forced fertilizer discharging device and the key factors affecting the working performance of the device were analyzed by kinematics and dynamics, three factors of auger diameter, auger speed and auger pitch of forced fertilizer discharging parts were designed and calculated. The auger diameter, auger speed and auger pitch were taken as the test factors, and the variation coefficient of fertilizer uniformity was taken as the response index, and single factor bench test was carried out to determine the value range of each factor. The order of the primary and secondary factors affecting fertilizer discharge performance was determined as follows: screw auger speed, auger pitch and auger diameter by variance analysis, and response surface analysis were carried out on the test results which analyzed by quadratic orthogonal rotation combination test. By using Design-Expert software, the optimal working parameter combination was determined as follows: auger speed was 120.09r/min, auger diameter was 23.90mm, and auger pitch was 21.54mm, at this time, the variation coefficient of fertilizer uniformity in the bench test was 7.18%. A field verification test was carried out by installing the designed compulsory fertilizer discharging device on the paddy field machinery. The results showed that the mechanical compulsory screw fertilizer discharging device worked steadily and had a low plugging rate, the anti-blocking effect was better than that of the fertilizer machine without this part.