Bagging is an important link from harvesting to transportation and storage of potatoes. To solve the problems of low efficiency and high damage rate of existing potato bagging machines, a new infusion, bag support and fixed weight bagging structure was designed, an efficient and low damage roller-type infusion potato fixed weight bagging machine was developed, and mechanical analysis of key components of the machine and kinematic analysis of key motion processes were conducted, and the main factors affecting the damage and bagging efficiency were identified as inflow bin door angle, conveying speed and loading volume. A quadratic regression orthogonal rotating combination test was conducted with the inflow bin door angle, conveying speed and loading volume as the test factors, and the breakage rate, injury rate and single-port bagging efficiency as the test indicators, and the test results were analyzed by ANOVA with Design-Expert 8.0.6 to determine the main order of the factors affecting the test indicators and to fit the test data. The test factors were analyzed by visually discerning the optimization region through response surface analysis, and the influence law of the test factors on the test indexes was analyzed. Using Design-Expert 8.0.6 optimization module and combining with the actual working situation to determine the optimal values of each factor, a test bench verification test was conducted on this basis, and the test results showed that when the inflow bin door angle was 45°, the conveying speed was 0.35m/s, and the loading volume was 27t/h, the breakage rate was 1.8%, the injury rate was 1.4%, and the single-port bagging efficiency was 12.4t/h, this parameter under the roller type guide flow potato fixed weight bagging machine breakage rate and injury rate was lower, and the bagging efficiency was higher.