In view of the present wheat seeder in complex field exists in the process of deep consistency and stability is difficult to control, through adjust the volume of overburden soil from aspects determine wheat sowing depth control perspective, a fuzzy PID control method was proposed based on sowing depth feedback, the designed wheat seeder sowing depth control system had high precision, which realized the automatic control of sowing depth, and the uniformity of sowing depth of wheat was ensured. The system was mainly composed of four parts: vehicle terminal, sowing depth detection module, pre sowing suppression roller detection module and pre sowing suppression roller adjustment mechanism, which can realize real-time sowing depth detection and adjustment of wheat sowing machine. The real-time sowing depth was obtained through the sowing depth detection module and used as feedback input. Combined with the preset sowing depth value, PID parameters were adjusted online according to the expert fuzzy rule and Mamdani reasoning method to obtain the control output. The driver was controlled to adjust the position of the suppression roll before sowing and the amount of soil cover during the operation constantly, so as to achieve real-time and accurate control of sowing depth and ensure consistency of sowing depth. The results of field experiment showed that the sowing depth fluctuated in a small range during the sowing operation. When the sowing depth was set to be 30mm, the average sowing depth was 30.13mm, planter speed was 3~5km/h, the standard deviation of sowing depth was 0.18mm, the average passing rate of sowing depth was 93%, and the mean coefficient of variation of sowing depth was 2.93%. The system realized real-time adaptive control of uniform sowing depth of wheat planter.