A device for puncturing body and introducing catheter includes a puncture needle, a guide wire, a peelable catheter sheath, and a puncture protector. The peelable catheter sheath includes an outer sheath and an inner sheath inserted into the outer sheath and having an expansible performance. The inner sheath has a hollow internal cavity, and the guide wire can pass through the hollow internal cavity. The puncture protector includes an inner core, a nut and a spring. The inner core has an inner core head, an inner core tail, and an inner core lumen. The nut has a nut lumen. The inner core is surrounded by the spring, one end of which abuts against the nut, and the other end of which is fastened to the inner core. The inner core tail lies within the nut lumen. The guide wire matches with the inner core lumen.
