In order to solve the explosion extinguishing problem of flexible detonating cord in the lethality enhancement device, an explosive network charge structure prepared by isostatic pressing was proposed. The numerical simulation and static explosion test of the principle prototype were used to study the dispersion characteristics of the fragments driven by the explosion of the network charge. The results show that network charge has good detonation stability and reliability, and can drive fragments to achieve low-speed echelon dispersion. The results of numerical simulation and theoretical calculation are basically consistent, and the error is controlled within 6.5%. The experimental results show that the fragments are scattered along the radial direction with velocity of 8.23 m/s, 17.78 m/s, 26.16 m/s, 36.93 m/s, 47.34 m/s, 56.23 m/s and 66.39 m/s, respectively. However, compared with the theoretical calculation value, it is obviously lower than the theoretical value, which is mainly due to the influence of network charge detonation wave on adjacent layer fragments. The standard deviations are 0.29 m/s, 0.30 m/s, 0.56 m/s, 0.96 m/s, 1.05 m/s, 1.12 m/s and 1.54 m/s respectively, which meet the requirements of engineering application.