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The change of center of gravity position of mountain agricultural machinery seriously affects its stability, traction and obstacle crossing ability. Aiming at the problems of design theory of center of gravity control device of mountain agricultural machinery chassis and the lack of special experimental platform, an omnidirectional control experimental platform of center of gravity of mountain agricultural machinery chassis was designed. The theoretical analysis showed that the slope angle caused the shift of center of gravity of chassis of mountain farm machinery, which seriously affected the stability of contour line driving and longitudinal climbing performance. Therefore, the overall structure of the experimental platform was determined by considering the relationship between slope angle and center of gravity position. The experimental platform mainly included inclination simulation device and center of gravity adjustment device. Among them, the inclination simulation device adopted the synergistic effect of multiple electric push bars to realize the omni directional slope simulation of 0° ~ 15°, and the center of gravity adjustment device adopted the mode of “ H-shaped ” multi-slide combination to realize omnidirectional center of gravity adaptive adjustment, so as to realize the center of gravity adjustment function under different inclination conditions. The performance test results showed that the mean value of simulated slope and the relative errors between data median line and simulated angle were within 0.5° in horizontal, longitudinal and oblique slope simulation of 0° ~ 15°. In the test, the maximum error of center of gravity position was - 21.4 mm. The center of gravity adaptive control can be achieved on the horizontal and vertical slopes of 0° ~ 15° and the oblique slopes of 0° ~ 12°. The average error of the test was 2.6% , 3.4% and 5.9% , respectively, and the maximum error of the center of gravity adjustment was 6.7 mm, 7.3 mm and 10.8 mm, respectively. The adaptive control of center of gravity can also be achieved on horizontal and longitudinal simulated slopes of 0° ~ 15° and oblique simulated slopes of 0° ~ 12°. The average test errors were 5.4% , 6.5% and 9.7% , respectively, and the maximum errors of center of gravity adjustment were 9.7 mm, 10.3 mm and 15.8 mm, respectively, which met the basic design requirements. The inclination simulation and center of gravity adaptive control method proposed can provide reference for the research of center of gravity control theory of agricultural machinery chassis in hills and mountains.