Convenient-to-assemble composite insulation board for building outer wall

The utility model discloses a convenient-to-assemble composite insulation board for a building outer wall, belongs to the technical field of composite insulation boards, and aims to solve the problem that the connection between boards is often limited by the structure by using anchoring parts or adhesives, so that the boards are inconvenient to assemble quickly and comprises a first composite insulation board, a second composite insulation board and a third composite insulation board, a second composite insulation board is arranged on one side of the first composite insulation board, two inserting openings which are symmetrically distributed are formed in the surface of one side of the first composite insulation board and the surface of one side of the second composite insulation board, and two connecting blocks which are symmetrically distributed are fixed to the surface of the other side of the first composite insulation board and the surface of the other side of the second composite insulation board. Where