The invention relates to a terminal connection box for an optical phase conductor, which is an optical cable connection box for 220KV optical phase conductor (OPPC). The connection box is provided with an upper box body and a lower box body, a composite hollow insulator is arranged between the upper box body and the lower box body, and an equalizing ring is arranged between the upper box body and the composite hollow insulator; the upper box body is provided with an optical phase conductor clamp, and a cable feeding hole is provided with an introduction tube, a rubber ring I and a nut; the cable feeding hole is internally provided with a rubber cone I and a small pressure ring I; the bottom of the upper box body is provided with a large pressure ring, a small pressure ring II and a rubber cone II; the large pressure ring is provided with a support screw I, a disc fiber board I and a disc fiber board cover I; the upper part of the upper box body is provided with a sealing gasket and an upper cover; the composite hollow insulator is internally penetrated by an optical fiber unit and filled with silica gel; the lower box body is provided with a sealing device of the optical fiber unit, an introduction cable of the lower box body is provided with an introduction cable clamp, a rubber ring II and a nut II; and the lower box body is internally provided with an optical fiber storage device.