Disposable cervical expander

The utility model relates to the technical field of cervical dilation equipment, and provides a disposable cervical dilator which comprises a dilation body, a traction body, a catheter and a liquid adding pipe, the two ends of the catheter are connected with the dilation body and the liquid adding pipe respectively, the traction body is arranged on the dilation body, the liquid adding pipe is divided into a flow injection pipe and a transition pipe, and the transition pipe is communicated with the catheter. The end part of the flow injection pipe penetrates into the transition pipe, and the anti-leakage assembly comprises a cover plate arranged in the transition pipe and capable of moving along the axis direction of the transition pipe; the supporting plate is arranged in the transition pipe and a gap is formed between the supporting plate and the inner wall of the transition pipe; one end of the spring is connected with the cover plate, and the other end is connected with the supporting plate; the cover plat