Abstract: Collecting operation is the last step of residual plastic film recovery. Most of the existing residual plastic film collectors collect residual plastic film by collecting box,which is not conducive to storage and transportation,and easy to cause secondary pollution. In order to solve the problems of loose texture and low efficiency in the process of residual plastic film collecting and unloading,a belt-type curlup film device which could realize film curling up and automatic film unloading was designed. The belttype curl-up film device of the residual plastic film recycling machine introduced coiled the residual plastic film into a film coil with a certain compactness,which solved the above problems. Through the design and analysis of the key components of the curl-up film device,the driving form of the curl-up film belt,the selection of air spring and other structure and operation parameters was determined. At the same time,the operation process of curling up film was analyzed,and the diameter range of the residual plastic film coil and the curl-up angle range were obtained. The hydraulic system of flip-unload film was designed for automatic film unloading. The mathematical model between the key parameters and the residual plastic film coil density was established by using the three factors and three levels Box-Behnken test design method. The optimal combination of the motion parameters of the belt-type curl-up film device was determined as follows: the forward speed of the unit was 5. 38 km/h,the curl up speed ratio was 1. 19,the curl up angle was 80°,the average coil density was 122. 7 kg/m~3,and the average time of film unloading and resetting was 33 s. The field test indicated that the operation performance of the belt-type curl-up film device was stable and the quality of the film coil was good,which met the design and practical operation requirements.