The utility model relates to an electric connector sliding sleeve port encapsulation molding device, comprising a left casing, a right casing, a middle casing and a gland bush, wherein the left casing and the right casing are combined into a whole by abutting connection, and a through hole is left at the middle; the combined body of the left casing and the right casing is arranged on the middle casing on which a through hole corresponding to the combined body of the left casing and the right casing is arranged; the gland bush is arranged below the middle casing; and the gland bush presses the periphery of the bakelite surface on the direction of an electric connector pin. The electric connector sliding sleeve port encapsulation molding device solves the problems of adhesive leakage and seepage caused by poor matching of the encapsulation molding and the electric connector pin, unreasonable structure of the encapsulation molding device, damage of the welding area and the pressing connection area caused by roundabout and complicated mounting and dismounting operations, low encapsulation molding effect caused by incorrect arrangement of adhesive injection holes and exhaust holes of the encapsulation molding device and roughness degree of the internal cavity surface not meeting the requirements and the like, thereby improving the stability and reliability of encapsulation molding quality of products, improving production efficiency and lowering production cost.