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In view of the problems that the existing wind selection residual film impurity separation device separates the residual film with soil, while the water-washing residual film impurity separation device consumes lots of energy and water, a countercurrent hook-type residual film mixture cleaning and separation device was designed. Through the design and dynamic analysis of the main working components, the operating conditions of the hook film tooth chain, the spiral conveyor speed range, the impurity removal motor speed range, and the water pump model required for the water circulation system were determined. A response surface test was conducted with the hook residual film tooth chain speed, the average flow rate and the water outlet height as test factors, and the residual film separation rate and the residual film cleaning rate as test indicators. A variance analysis was conducted on the test results, and it was concluded that the influence of each test factor on the residual film separation rate from large to small was the water outlet height,the average flow rate,the hook residual film tooth chain speed;the influence on the residual film cleanliness rate from large to small was the average flow rate,the hook residual film tooth chain speed,the water outlet height. The parameters of the test indicators were optimized, and the optimal parameter combination was obtained: the hook residual film tooth chain speed was 0.196m/s, the average flow rate was 1.51m/s, and the water outlet height was 457.0mm. At this time, the residual film separation rate and the residual film cleaning rate were 89.95% and 93.46%. The optimization results were experimentally verified, and the residual film separation rate and residual film cleanliness rate were obtained as 88.72% and 92.35%, respectively.