In order to improve the stability and uniformity of paddy field side deep fertilizing and discharging apparatus, enhance the ability of fertilizer regulation, and ensure the efficiency and quality of paddy field side deep fertilizing apparatus, a kind of conical-disc and push plate double-row fertilizer apparatus was designed according to the agronomic requirements of paddy field fertilizing in Heilongjiang Province. The working principle of the fertilizer apparatus was described, the mechanical models of different stages of fertilizer were constructed, and the structural parameters and critical speed were determined. The influence of the number of push plates on the fertilizer filling capacity and fertilizer discharge performance was simulated and analyzed by using the discrete element software EDEM. It was concluded that when the number of push plates was 8, the fertilizer discharge apparatus had the best fertilizer discharge performance. The full factor test method was used to carry out the bench test of the fertilizer discharge capacity and performance of the fertilizer apparatus under the condition that the rotating speed of the conicaldisc ranged from 15r/min to 45r/min and the opening of the fertilizer discharge port ranged from 5mm to 25mm. The results showed that the range of fertilizer discharge was 122~934kg/hm2, which had a high linear correlation with the rotating speed of conical-disc and the opening of fertilizer discharge port, and had the highest correlation with the rotating speed of conicaldisc. The variation coefficients of consistency of double row fertilizer discharge, stability of total fertilizer discharge and uniformity of fertilizer discharge ranged from 1.01% to 3.88%, 1.05% to 3.81% and 6.64% to 15.79%, respectively. The maximum variation coefficients of consistency of double row fertilizer discharge under the inclined state of fertilizer apparatus was 6.17%. The experimental results met the requirements of paddy field side deep fertilization performance. The research result may provide a reference for the implementation of paddy field side deep fertilization technology and the design of disc fertilizer apparatus.