The invention relates to an electric connector assembly, which comprises an insulating body, a plurality of conducting terminals held in the insulating body, a lower housing arranged on the insulating body and a metal frame, wherein the insulating body is provided with an upper wall, a lower wall, side walls connecting the upper wall with the lower wall, an upper groove formed by downwards sinking of the upper wall, and a lug extending upwards from the bottom of the upper groove; the conducting terminals are exposed on an upper surface and side surfaces of the lug; the metal frame covers the upper wall and the side walls, the lower housing covers the lower wall, and the insulating body is also provided with a structure for being connected with a draw string. Compared with the prior art, the electric connector assembly of the invention has the following beneficial effects: friction between the draw string and the insulating body is weaker than that between the draw string and a metal housing, thereby overcoming the defect that the draw string is likely to break due to wearing.