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In order to overcome the shortcomings of traditional linear soil-bin test bed, a kind of rotary round soil-bin test bed was proposed. To compensate the processing and assembly errors of the large-size round soil-bin test bed and provide convenience for the following simulating field trials of agricultural machinery, a driving scheme of rotary round soilbin test bed driven by tire friction was optimized. Mechanical adjusting device for initial installation position of the rotary round soilbin test bed driven by tire friction was designed, and the soil-bin roundness compensation capability was calculated. The control system for the proposed rotary round soil-bin test bed was designed, and the closed-loop system was established with PLC as controlling unit and servomotor as executive device. All of these made the soil-bin test bed run at a steady speed; it was found that the test bed can compensate for roundness of soil-bin, it can smoothly run at the speed of 0~3.8r/min, the maximum standard deviation of speed fluctuation was 0.038r/min, the longest time required from the start to smooth running was 9.8s. Transplant experiment with planting mechanism was carried out; the spacing coefficient of variation was 4.46% which means good uniformity and can well meet the transplanting agronomic requirements.