Disclosed are a reducer cannula device (15, 25) with a driving mechanism, and a puncture device (1, 2, 3, 4). The reducer cannula device comprises a reducer cannula assembly (300, 400), a lower cover plate (104) and a lower housing (103). The reducer cannula assembly (300, 400) is clamped and fixed by means of the lower cover plate (104) and the lower housing (103). The reducer cannula assembly (300, 400) comprises three split cannulas (301) capable of moving in a radial direction and a thin film cannula (101) wrapped around the split cannulas (301). The split cannulas (301) are arranged in a circular ring shape along the longitudinal axis, and together with the thin film cannula (101), form a hollow channel for a surgical instrument to access or exit therefrom. The reducer cannula assembly (300, 400) also comprises a driving mechanism. The driving mechanism drives the split cannulas (301) to move linearly close to the longitudinal axis or away from the longitudinal axis in a radial direction, so as to achiev
