The invention provides a cable groove connector which is arranged in a cable groove. The cable groove is provided with a transverse groove body and a longitudinal groove body. One end of the longitudinal groove body is vertically connected to the inner side of the transverse groove body. The cable groove connector comprises upper bearing box iron arranged at the end, connected with the transverse groove body, of the longitudinal groove body, outer transverse box iron, inner transverse box iron, two pieces of longitudinal box iron and corner box iron, wherein the upper bearing box iron is parallel to the transverse groove body and is connected to the bottom face of the cable groove through a plurality of foundation bolts, the inner transverse box iron is arranged on the inner side of the transverse groove body, the outer transverse box iron is arranged on the outer side of the transverse groove body, the two pieces of longitudinal box iron are arranged on the two sides of the longitudinal groove body respectively, and the corner box iron is connected between the inner transverse box iron and the longitudinal box iron on the same side of the longitudinal groove body. The cable groove connector is convenient to construct, safe and reliable, cable turning is facilitated, and a cable is not damaged.