The utility model discloses a novel butt-joint anti-bird cover for a high-voltage transmission line. The novel butt-joint anti-bird cover comprises a cover body, wherein the cover body is in a disc shape. The upper surface of the cover body is provided with a main reinforcement rib. The cover body is divided into a left cover and a right cover, wherein the left cover and the right cover are respectively in a semicircle shape; the left cover and the right cover are clamped and connected at the main reinforcement rib; and the left cover and the right cover are connected through bolts. The novel butt-joint anti-bird cover is solid and light, easy to assemble and disassemble, and scientific and reasonable in structure design; the accidents, such as insulator grounding, discharging and tripping, due to dropping of a lot of birds droppings and foreign matters above a suspension insulator string are fundamentally prevented; and safe operation of an electrical power system is guaranteed.