Abstract: 【Objective】 Since the existing residual membrane recycling machine has the problem of automatic membrane unloading difficulty and membrane leakage,a toothed chain type residual membrane recycling machine has been designed.【Method】 The overall design scheme was described,and the key devices included membrane lifting device,conveying device,membrane picking device and membrane unloading device,etc. The main factors affecting the membrane picking rate were analyzed and the parameters were optimized.【Result】 The order of influence of the test factors on the membrane picking rate is: driven sprocket speed under the membrane picking device ＞ working speed of the machine ＞ penetrating angle of the membrane lifting device. The optimal parameter combination of the optimization model is: the driven sprocket speed under the membrane picking device is 197. 579 r/min,the working speed of the machine is 7 km/h,and the penetration angle of the membrane lifting device is 41. 173°. Under these parameters,the membrane picking rate is 89. 0% according to the simulation test results. The experimental results show that the average membrane picking rate reaches 91. 4% under the parameters of the driven sprocket speed 200 rpm under the membrane picking device,the working speed of the machine is 7 km/h,and the penetration angle of membrane lifting device is 41°.【Conclusion】 The field experiment shows that the optimized parameter combination is reliable and meets the design requirements of the residual membrane recycling machine,which can provide a reference for the subsequent research of the tooth chain type residual membrane recycling machine.