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In order to reduce the harm caused by the body vibration to the composite structure of urban rail vehicles, the damping force adjustment technology is used to optimize the design of the body vibration reduction control system of the composite structure of urban rail vehicles. In the case of considering the composite structure and working mode of urban rail vehicles, the composite structure model of urban rail vehicles is constructed. In this model, combined with the operating environment of urban rail vehicles, the vibration process of urban rail vehicles in different scenarios is simulated. Using the installed body running sensors, the real-time running data of the urban rail vehicle is obtained, the vibration characteristics of the urban rail body are extracted, and the theoretical value of the adjustment amount of the body damping force is calculated. The adjustable damper is used as the executive element to perform the task of adjusting the adjustable damping force. With the support of the system vibration reduction controller, the vibration reduction control function of the composite structure body of the urban rail vehicle is realized. Through the system test, it is concluded that the vibration frequency and vibration amplitude of the vehicle body are significantly reduced after the application of the damping force adjustment-based composite structure body vibration control system for urban rail vehicles.