In order to solve the problem of stable power supply and condition monitoring of railroad wagon vehicles, to further enhance the transportation efficiency and reduce operating costs. In this paper, a self-powered control and monitoring system for smart trucks is developed, and a corresponding test platform is built. The test results show that, the axle end power generation device can reach 110 W of low-speed high-power power generation and structural components without significant temperature rise. The redundant design of the power control circuit improves the stability of the power supply of each type of power supply for the condition monitoring components. The speed signal processing mechanism can provide stable electrical signals to reduce the response time of air braking, enhance braking performance and improve the reliability of operational safety, and the visualization of monitoring data can facilitate condition repair to reduce operating costs.