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In order to solve the problems of complicated receiver system and the poor positioning precision of the existing shortwave radio monitoring and positioning system ,designs a high precision positioning system based on TDOA short wave. The system adopts the software radio architecture design, using radio frequency direct bandpass sampling,extracts and transmits the baseband IQ data through FPGA and CPU,estimates and locates the interference source by the TDOA and particle algorithm;and adopts the combined GPS and PLL clock scheme,as well as VPN data transmission channel; gives a block diagram about the short wave positioning system, analyzes the system module and the working principle.Positioning this known shortwave signal by using this system,experimental results show that the positioning means is superior to the traditional;it shows that the system has the advantages of convenient use,flexible placement and high positioning accuracy.