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The fracture process of the metal cylindrical shell under the action of implosion is numerically simulated by AUTODYN finite element software for the expansion of cracks on the surface of the cases under the action of implosion loading. Numerical computations were used to determine the effect law of engineering factors such as the energy density of explosives, shell thickness, and shell material on crack-related parameters. The results show that the shell fracture radius along the axial direction remains nearly constant, and its value is less influenced by the energy density of explosives. The axial crack propagation velocity of the shell from the location of crack initiation to the non-exploding end of the shell shows a trend of change from high to low, fluctuating down. The axial crack propagation velocity and crack circumferential density both increase with the explosive energy density. The fracture density fluctuation range is between 0.4~0.73/mm. The law can be used to study the fracture damage of metal cylindrical shell structures under high impact.