Electric connector and electric connector assembly

The utility model relates to an electric connector and an electric connector assembly. The electric connector assembly comprises an electric connector and a fixing box used for accommodating and fixing the electric connector, wherein the fixing box comprises a box body portion, the box body portion comprises oppositely arranged side walls, the inner side surface of the side wall is sunken to form an accommodating groove and a guiding groove, and one groove wall of the accommodating groove forms a stop surface. The electric connector comprises an insulating body, conductive terminals fixed in the insulating body and a metal shell coated at the periphery of the insulating body, wherein two sides of the metal shell extend toward the outer side to form elastic fixing pieces respectively, and the fixing pieces are matched with the accommodating grooves and the guiding grooves correspondingly to realize fixation and replacement for the overall electric connector.