A catheter which locks pads (1301, 1302) and cuts sutures (901, 902), said catheter comprising an inner sheath tube (1000) and an outer sheath tube (600) connected in a slidingly sleeved manner, an inner tube head (500) being fixed at a far end of the inner sheath tube (1000), the inner tube head (500) movably docking with a lock (200) via a pin (504), the inner tube head (500) at least being provided with a suture hole (503) and a pull line ring hole (502), at least a portion of the suture hole (503) being located between the pull line ring hole (502) and the pin (504), a position at a far end of the inner tube head (500) and between the suture hole (503) and the pull line ring hole (502) being provided with a cutting platform, the cutting platform being used for cutting the sutures (901, 902) matched with a pull line ring (800).