In order to solve the problems of potato and stone separation in main potato production areas in northern China, especially in the area of combined harvest operation, which problem is the large workload for farmers to pick up and low cleaning efficiency. The airflow suspension technology was used and combined with shaking and layered separation, potato-stone separator based on airflow suspension technology was developed, and the cleaning characteristics under different parameters based on the separator was studied. The key parts of the potato-stone separator based on airflow suspension technology mainly included centrifugal fan, air pipe, material feeding device, impurity discharge device, shaking device and material falling position switching device. According to the different aerodynamic characteristics of different materials, the potato and stone could be separated automatically in the process of movement with the aid of high-speed airflow suspension and swing action of shaking sieve. The device give full play to the double advantages of airflow suspension technology and shaking separation. Field tests showed that, the impurity removal rate was 98.34%, the potato selection rate was 96.71%，and each performance index reached the industry standard when the wind speed was 35m/s, sieve angle was 18°and crank angular velocity was 30rad/s. This device could ensure the potato selection rate and the impurity removal rate, and the cleaning efficiency was improved, the production cost was reduced. It could provide a technical reference for further exploring the technology of potato harvester and potato-stone separator.