Aiming at the issues of fertilization and weeding operations in paddy field during the tillering stage, there are many problems in the operation, serious environmental pollution and uneven nutrition distribution. A kind of rice planting that can be completed synchronously in combination with the agronomic characteristics of deep fertilization and weeding at the tillering stage was designed. According to the D’Alembert’s principle, the dynamics analysis of the start-up acceleration stage of the implement was carried out, and the mathematical model of the driving torque required for the active weeding wheel was established. The theoretical value of the maximum driving torque required for the active weeding wheel was 59.05N·m, and the control system for the deep fertilization device was completed. And walking control system design was implemented. The quadratic orthogonal rotation combination design was adopted. The tool forward speed and the blade opening diameter were the influencing factors. The average fertilization amount and the variation coefficient of fertilization uniformity were used as the response indicators. The JPS-12 seed metering instrument was used to test the test rig. A bench test was performed on the row fertilizer performance of the deep fertilization device. The variance analysis and response surface analysis of the test data were performed by using Design-Expert software. The mathematical model between the influencing factors and the response indicators was obtained. The mathematical model was optimized and the optimization results showed that at a forward speed of 0.40m/sand a blade opening diameter of 16mm, the average fertilization amount of fertilization was 0.20g, and the minimum value of fertility uniformity was 21.7%. Field performance tests were carried out on the implements. When the blade opening diameter was 16mm, the implement advance speed was 0.40m/s, and the given fertilizer amount was 67.5kg/hm2, the fertilizer amount deviation was controlled within 3.54%, and the implements were used for weeding at different forward speeds. All of them were greater than 78.5%, which met the agronomic requirements for deep tillering and inter-row weeding in paddy field.