The invention relates to a medical appliance, in particular to a lumbar intervertebral disc soft top pressing device. The device consists of a plate shaft, a fixed frame, a water bag, a propeller plate, a screw rod, a rotary bar, a fixed shaft, a lock sheet, a lock ring, a strap and a lock plate, wherein the middle part of the fixed frame is provided with a screw hole; the screw rod is positionedin the screw hole; and the outer end of the screw rod is provided with the strip-shaped rotary bar and the inner end is in the structure of a hemisphere. The inner sides of two opposite edges of the fixed frame are respectively provided with a slide groove; and two ends of the propeller plate are respectively positioned in the slide groove. The rubber water bag is positioned at the two edges of the fixed frame and in a U-shaped room formed by the propeller plate. The device has horizontal and perpendicular fixing measures to be capable of ensuring the cure effect when patients seat or stand, and adopts the water bag to press the nucleus pulposus so as to improve the conformability in the curing process.