The utility model discloses a cyst expands splits ware, include: sheath pipe and pjncture needle, the pjncture needle include the pjncture needle main part and with the handle that the pjncture needlemain part is connected, the one end that the handle was kept away from to the pjncture needle is equipped with the syringe needle, the sheath pipe box connects in pjncture needle main part outer wall, and the length of pjncture needle main part is greater than the length of sheath pipe, the sheath pipe includes the cyst liquid outflow end who meets with the handle to reach the cyst liquid streamincoming end that meets with the syringe needle, the sheath pipe is close to cyst liquid stream incoming end and is equipped with first utricule, second utricule and third utricule, and first utricule, second utricule and third utricule overlap in proper order locates sheath outside of tubes surface. The embodiment of the utility model provides a grasp the cyst membrane through first utricule andthird utricule, prevent that cyst expands splits ware from droing in the use to burst the cyst membrane through the second utricule, the second utricule produces certain pressure to the cyst membrane,plays hemostatic effect, has certain expansion effect to fistulization opening simultaneously, prevents that fistulization opening is closed, thereby prevents that the cyst from recurring in the normal position.