Building external wall heat preservation and decoration composite board with pendant connecting system

The utility model discloses a building external wall heat preservation and decoration composite board with a pendant connecting system, which relates to the technical field of heat preservation and decoration composite boards and comprises a composite board body, two T-shaped sliding rails are symmetrically mounted on the side portion of the composite board body, two movable sliding blocks are slidably mounted on the two T-shaped sliding rails respectively, and the pendant connecting system is connected with the two movable sliding blocks. L-shaped hanging pieces are connected to the side portions of the four movable sliding blocks, handle blocks are arranged on the movable sliding blocks, first inserting rods are installed at the ends of the handle blocks, and a plurality of first inserting holes are evenly formed in the T-shaped sliding rails. The hanging piece is reasonable in structure, when the handle block is moved, the first inserting rod can be driven to move into or out of the first inserting hole, a