The Split Hopkinson Pressure Bar (SHPB) test was use to study the performance of stab delay initiating device affected by overload shock. The structural damage of stab delay initiating device was analyzed by CT. Results show that performance and structural damage of stab initiating device are distinctly different after overload test. When the interface of initiating device charge moves, the delay time becomes short, and the sensitivity of stab delay initiating device decreases after overload, the energy output do not change much.