The supercavity phenomena on rocket depth was simulated with computational fluid dynamics software Fluent. Based on the structured grid, the k-ε turbulence model was used to simulate the formation of supercavity on the rocket depth charge changes with the cavitator parameters such as cavitator specifications, cone angle, ventilation and so on. The simulation results show that when the rocket depth charge forms the critical supercavity, the faster its speed is, the more the ventilation is required; at the same speed, when the rocket depth charge forms the critical supercavity, the larger cavitator diameter is, the less the ventilation is required. Comparing the supercavity shapes of two kinds of cavitator, the rocket depth charge equipped by conical disc cavitator forms the supercavity easily. Comparing the simulation results with the experiment results, they are basically consistent.