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In order to ensure the efficiency of harvester and reduce the damage rate of potato harvester during bagging process, a kind of bagging unloading device was designed, and the collision process and stress of the potato on the device were studied based on discrete element simulation. The device can complete the processes of cache collection, bag loading and bag unloading, ensure the working process without stopping, and improve the working efficiency of the machine. Through theoretical analysis, the force relation of lifting hydraulic cylinder was obtained and the type selection and layout of lifting hydraulic cylinder were determined. The collision process of potato block was analyzed, the relation expression of the collision stress was obtained, and the influencing factors of the stress were determined as the angle between the box wall and the horizontal plane and the normal impact velocity. Through analysis and calculation, the range of structural parameters of the collecting potato box was obtained, and the corresponding hydraulic system was designed according to the working requirements of the unloading bag device of the collecting potato. In order to verify the rationality of the selected work and the range of structural parameters and the stress of the potato in the bagging process, the discrete element simulation test was carried out by measuring the material characteristics of the potato and giving the motion properties of the corresponding components. The accuracy of the particle model was verified by the stacking angle and the corresponding single factor simulation test was carried out. The maximum force of the particles at each time step and the mean value of the forces at each stage were selected as the evaluation index.By analyzing the simulation test results, the influence of various factors on the force on potato particles was clarified, and corresponding simulation tests were conducted on the working sequence.The order of potato harvesting and bagging was determined. The simulation test results showed that the damage rate of potatoes collected first and then bagged was 1.07%, and the damage rate of potatoes collected first and then bagged was 3.04%. And the correctness of the working sequence of the first collecting potatoes and then bagging was verified through field experiments. The field experiment results showed that the potato damage rate during the whole machine operation of first collecting potatoes and then bagging was 2.59%, which was lower than that of the potato damage rate（3.71%） during the whole machine operation of the first bagging and then collecting potatoes.