To investigate the water-entry cavity and the dynamic characteristics of the revolution body, the Fluent was adopted for the multiphase flow and the movement of the water-entry revolution body with the dynamic mesh. The effectiveness of the numerical method was verified by comparing the numerical results with the experimental results. Based on the method, the flow field characteristics during the oblique water entry of the revolution body with different velocities and angles is studied. Results show that in the same water depth, the diameters of the water-entry cavity increased slightly as the velocity of water entry increased, and decreased as the angle of water entry increased. The velocity of water entry had a great influence on the pressure distribution in the flow field. The maximum pressure of the flow field increased as the water-entry velocity increased for the same water depth. The angle of water entry had little influence on the maximum pressure of the flow field near the revolution body, but the minimum pressure increased as the water entry angle increased. When the angle of the water entry was larger, the point of the maximum pressure in the generatrix of the cone shifted to the right endpoint gradually, but its value had little difference. The drag coefficient peak value differed slightly with increasing the velocity of water entry, but became larger as the angle of water entry increased. The stable drag coefficient became larger with the increase of water-entry velocity.