The compact drill bit is the key of the DTH hammer percussion compact drilling technology. Its structure directly affects drilling efficiency, pore forming quality and application effect. Nonlinear finite element theory was used to analyze the changing laws of elastoplasticity and compressibility of soil under dynamic load. The result showed that: the phenomenon of piling effect is produced by conventional drill bits in the process of percussive compaction drilling is the main reason for the decrease in drilling efficiency. In order to overcome the influence of the pile effect, ANSYS/LSDYNA was used to perform numerical simulation analysis on the drilling process of stepped drill bits and cam spinning drill bits, and verified by actual drilling experiment. Both the numerical simulation analysis and the experiment results showed that the cam bit can effectively avoid the rebound problem of the soil during the drilling process and reduce the influence of the pile effect on the drilling efficiency. The experimental results are in good agreement with the simulation results, indicating that the numerical simulation results are relatively reliable.