The invention discloses an internal snare device used for a drum. The internal snare device comprises a snare and two connecting bases, wherein each connecting base comprises a fixed base, a sliding block, a lifting adjustment screw rod, a sliding pin shaft, a horizontal sliding block and a snare tightness adjusting screw rod, wherein the sliding block is mounted in the fixed base in an up-down sliding manner, an inclined groove is formed in the sliding block, the sliding pin shaft is mounted in the inclined groove, the lifting adjustment screw rod is mounted in the fixed base in a rotated manner, one end of the lifting adjustment screw rod penetrates a drum cavity, the other end is in threaded connection with a threaded hole of the sliding pin shaft, the horizontal sliding block is fixedto the snare, and the snare tightness adjusting screw rod is in threaded connection with a threaded hole of the sliding block after penetrating the horizontal sliding block. The internal snare deviceused for the drum can realize tightness adjustment of the snare, can realize the adjustment of distance between the snare and a drum surface, is easy in installation, and has low requirement for machining precision.