The invention discloses an adhesive tape cutting device. The adhesive tape cutting device comprises a mounting plate, a first adhesive tape clamping rod, a second adhesive tape clamping rod and an adhesive tape cutting rod, wherein the mounting plate is provided with a first end and a second end, the first end and the second end are opposite to each other, and the direction in which the second endpoints to the first end is the X-axis direction; the first adhesive tape clamping rod is fixed to the first end of the mounting plate and extends in the Y direction; the second adhesive tape clampingrod is rotationally fixed to one side of the first end; and the adhesive tape cutting rod is rotationally fixed to the other side of the first end. The adhesive tape cutting device has a first stateand a second state, specifically, when the adhesive tape cutting device is in the first state, the second adhesive tape clamping rod and the first adhesive tape clamping rod extend in the same direction and clamp adhesive tape jointly, and a first included angle is reserved between the adhesive tape cutting rod and the first adhesive tape clamping rod; and when the adhesive tape cutting device isin the second state, the adhesive tape cutting rod rotates in the Z-axis direction and is moved to the shearing face of adhesive tape, and the clamped adhesive tape is cut off. By arranging an adhesive tape fixing device and the adhesive tape cutting device into a whole, the size of the adhesive tape cutting device is greatly reduced, and the occupied space is saved.