Abstract: In order to achieve the mulch film recovery and reuse, this automatic control system was designed.The model of soil cleaning and decision rule of image recognition were achieved, and then the control flow was simplified by optimization of system.The model for soil depth and soil cutting force, and model for soil depth and planing soilforce were achieved.The force was calculated by these model.Film appearance was test by image recognition.Monochrome and binaryzation was taken for image, and the highlight area ratio and contour circumference was taken as the key parameter to determine the film appearance.The control flow was optimized.The test for system was taken, and the result showed that recognition rate of plastic film exceeded 93%,the film injury rate was 0.71%-2.86%,and soil cleaning rate exceeded 80%,this system had high control accuracy.