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In a special aerospace environment, due to interference conditions such as electromagnetic waves, it is easy to cause spacecraft equipment to deviate from the preset trajectory path. To solve this problem, a spacecraft on-orbit attitude monitoring system based on the Internet of Things and ADRC is designed. Analyze the pose control requirements in the monitoring system of the Internet of Things, connect the active vibration controller and the spacecraft attitude controller in layers, and establish a monitoring and induction connection between the host structure and the spacecraft components with the help of FBG strain sensors to realize on-orbit attitude monitoring The hardware application structure design of the system. On this basis, the strain sensor is calibrated to determine the lateral on-orbit strain effect of the spacecraft by calculating the attitude transfer coefficient, and then the ADRC principle is used to extract the best travel state signal of the spacecraft’s on-orbit attitude sensing parameters. Improve the on-orbit attitude monitoring control law of spacecraft, and realize the design of on-orbit attitude monitoring system based on the Internet of Things and spacecraft. Comparative experiment results show that, compared with fiber-optic sensing monitoring systems, the IoT monitoring system can effectively shield electromagnetic interference and ensure that the spacecraft will not deviate from the preset trajectory in the special aerospace environment.