In downhole impulse sound source deep detection logging, the sound insulator is interposed between the impulse sound source transmitter and receiver to suppress drill collar waves. At present, the most common method is to notch the surface of the drill collar to suppress the drill collar wave. In this paper, the variation law of the strength of the grooved sound insulator with the groove parameters is studied by numerical simulation, and the appropriate groove parameters are selected for the sound insulation of the single-carved external groove and the periodic internal and external staggered grooved sound insulators. The effect comparison proves the sound insulation superiority of the latter. The research results provide a basis for the sound insulation body to have good mechanical strength under the condition that the sound insulation performance is satisfied.