The invention discloses an endocaridal electrogram positioning connecting line, and relates to the medical field. The endocaridal electrogram positioning connecting line comprises a connecting line body, one end of the connecting line body is connected with a metal alligator clip, and the other end of the connecting line body is connected with a conducting plate joint; the plate joint is composed of an electrode plate and an inlaid plate which is inlaid into the electrode plate and provided with a lug, and the connecting line body sequentially comprises a reinforcing component, a conducting unit, an outer shielding layer and a sheath layer from the inner side to the outer surface. According to the endocaridal electrogram positioning connecting line, the problems that when central venous catheters with different brand specifications and electrocardiograph monitors with different brand specifications are connected, due to the fact that the joints are not matched, time is consumed, the disinfection effect is difficult to ensure, and the anti-jamming capacity is poor can be solved.