Considering that the vibration isolation system of the atomic gravimeter is affected by ambient temperature, pressure, humidity, and other factors, the parameters such as the natural vibration frequency may change, and the system is also subject to random vibration interference from the ground. Because the control accuracy of the vibration isolation system can be significantly improved when there is no observation error, the control accuracy of the vibration isolation system is mainly limited by the observation accuracy. Design a high gain observer sliding mode control law to solve the problem that current control methods do not consider the randomness of external disturbances such as ground vibration and model uncertainty; By establishing a high gain observer sliding mode control, the vibration velocity and displacement of the active vibration isolation system of the cold atom gravimeter rapidly converge, thereby improving the control accuracy of the active vibration isolation system of the cold atom gravimeter.