The utility model relates to a hollow slag interlayer steel pipe power transmission tower member, a main body of the hollow slag interlayer steel pipe power transmission tower member is made of steel material, the main body is in the shape of a cylinder combined by an outer steel pipe, an inner steel pipe and flange plates, the outer steel pipe is concentrically sheathed outside the inner steel pipe in the same length with the outer steel pipe, a hollow interlayer is formed between the outer steel pipe and the inner steel pipe, slag is filled in the hollow interlayer, two end parts of the cylinder are used for covering and pressing the outer steel pipe, the inner steel pipe and the hollow interlayer, and the flange plates are welded at the two end parts, and connecting holes are distributed on each flange plate in the circumferential direction. The inner steel pipe and the outer steel pipe have higher rigidity, thereby being capable of effectively preventing overall instability of the member; abandoned material with certain bearing capacity, which is filled between the inner steel pipe and the outer steel pipe, can effectively prevent local instability of the inner steel pipe and the outer steel pipe; and the member has good mechanical properties under pressed, pulled and bent states.