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To meet the needs of large area and whole process reconstruction of the shock wave overpressure field, the high-precision extraction method of the shock wave arrival time was studied. First, the shock wave arrival time extraction model of STA/LTA was analyzed, and then the shock wave arrival time extraction method based on the time window entropy was proposed in combination with the information theory theory. Thirdly, the extraction accuracy of the shock wave arrival time under different noise conditions was compared through simulation experiments, The extraction accuracy of the two methods under the same noise condition is compared. The analysis results show that the extraction accuracy of this method is basically kept at 0.77% under different noise conditions. Under the condition of low signal to noise ratio, the extraction accuracy of this method is about 6% higher than that of STA/LTA, which ensures the extraction accuracy of shock wave arrival time under the condition of low signal to noise ratio, and solves the problem that STA/LTA method misses the detection due to small signal change amplitude, It avoids unnecessary extraction errors, realizes higher precision extraction of shock wave arrival time, has higher extraction precision, can provide effective arrival time characteristic parameters for high-precision reconstruction of shock wave overpressure field in large areas, and has certain theoretical significance and engineering use value in damage effectiveness parameters of high-value ammunition.