Abstract: The film left in farmland brings "white pollution" to soil. At present, there are two main methods for the recovery of residual film in plough layer: one is the method of soil extraction and screening. Firstly, the soil is transported to the vibrating screen by the soil lifting mechanism, and then the soil and residual film are separated under the action of the vibrating screen. The other is the comb type residual film recovery method. Under the continuous rotation of the comb teeth, the comb teeth are inserted into the topsoil to loosen the soil, and the residual film is continuously removed from the soil. In order to solve residual film pollution of plough layer soil, a comb tooth loosening and pneumatic stripping plough layer residual film recovery machine was designed. The machine was mainly composed of frame, comb tooth, comb roller, gravity sedimentation chamber, centrifugal fan and so on. Comb tooth roller was composed of multiple rows of comb tooth installed on the roller. The function of comb roller was to loosen soil and separate residual film and soil through continuous rotation. EDEM software was used to establish virtual operating system of comb roller, and study the effects of comb tooth arrangement and comb tooth structure on forward resistance and resistance moment. According to the simulation results, the spiral arrangement of comb tooth was determined. The kinematics equation of residual film in film suction area was established. By solving equation, the influence of the rotation speed of the comb roller and the air speed at the film suction port on the motion track of the residual film were analyzed. It was determined that the rotation speed of comb roller should be less than 120 r/min, and air speed in film suction port should be greater than 15 m/s. In order to obtain the best combination of operating parameters, a response surface test was performed on soil tank. The optimal parameter combination was obtained: angle of film suction port was -7°, the forward speed was 2 km/h, the rotation speed of comb roller was 100 r/min, and the air speed in film suction port was 22 m/s. The field test results showed that when working with the best combination of parameters, the residual film pick up rate was 55.04%, which was 1.63% lower than the predicted value, indicating the optimization method was reliable.