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An indoor moving target positioning system using UWB(Ultra-wideband) technology was designed. Through the base station installed in a specific location in the room and the tag carried by the mobile object, the improved standard TDOA(Time Difference of Arrival) positioning algorithm obtains the real-time location information of the moving target and completes the accurate positioning of the indoor moving target. Qt was used to develop a PC application software that can display the position and movement trajectory of the positioning target in real time. Finally, an experimental test platform was set up to test the system and the obtained location information was compared with the actual data. The result shows that the overall system communication is stable and meets the positioning requirements.