The invention, which belongs to the technical field of the venous duct, discloses a peripherally inserted central venous catheter. The invention aims at providing a peripherally inserted central venous catheter having an advantage of reducing occurrence of blood outflow in a catheter. The peripherally inserted central venous catheter is characterized in that one end, far away from a transfusion joint, of a catheter body is enclosed; a ring slot is formed in one end, far away from a transfusion joint, of the outer wall of the catheter body; a through hole is formed in the bottom of the ring slot; a silica gel film covering the bottom of the ring slot is arranged on the wall of the ring slot; and one end of the silica gel film is fixed with the wall of the ring slot and the other end is abutted against the wall of the ring slot. A sliding blocks is arranged in the through hole in a sliding connection mode; a drive block that enables the sliding block to move in the through hole and extend out of the through hole to push away the silica gel film is arranged on a guiding steel wire; a medicine liquid through hole for guiding blood into the catheter body is formed in one end, pushing away the silica gel film, of the sliding block; a stay cord is arranged at one end, abutted against the guiding steel wire, of the sliding block; and the stay cord passes through an opening formed in one end of the catheter body.