Based on the application of the rotating magnetic joint platform in high-precision and high stability pointing control of spacecraft, a dynamic model of the rotating magnetic joint is established, taking into account the dynamic characteristics of the rotating magnetic joint and the influence of platform and load disturbance actions. The decoupling control method of the load compartment is further derived, transforming the multi-input and multi-output system of magnetic joint cross coupling into a single-input and single-output system. On this basis, a load compartment pointing control method is further proposed, It can achieve complete isolation of platform cabin rotation disturbance. Through simulation analysis and verification, based on the established dynamic model of the rotating magnetic joint, using the pointing control method based on the load chamber can achieve high-precision and high stability control of the rotating load chamber.