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In order to obtain the action information before and after the shell lands, and to overcome the instability, delay and record integrity problems of the manual pre-trigger high-speed camera, as well as the shortcomings of internal trigger loss information, a wireless trigger system based on UWB module was designed. This system takes FPGA as the core controller of UWB module, and RADIO frequency chip DW1000 as the core of UWB module. UWB modules are respectively placed as labels in artillery shells and ground stations. The DISTANCE between two points is accurately calculated through TOA ranging algorithm, and the trigger signal is given when the distance is less than a given distance, so as to realize the early trigger of high-speed cameras. Static error measurement and range test were carried out for the ranging system. The static error was between 20cm and 40cm. The range test was given a distance of 300 meters, and the test results were 291.34m, 288.48m and 293.27m, respectively. The experimental results show that the trigger system can complete the pre-trigger and meet the pre-trigger requirement of the shell recording experiment.