The invention provides an adjustable connector for an integrated thermal insulation wallboard and an installation method, and relates to a part of an architectural decorative board. The connector comprises a screw (1), a nut (2), an adjustment stand (3), a connecting plate (4), an inserting angle (5), hanging plates (6), and a base (7). The nut (2) is installed at the upper portion of the screw (1), the base (7) is formed at the bottom of the screw (1) which is inserted in a hole of the adjustment stand (3), the hole is a round hole and is formed in the middle of the adjustment stand, and the diameter of the hole is equal to the external diameter of the screw. One end of the adjustment stand is fixed with the connecting plate (4) in the middle of which the triangular inserting angle (5) is formed, and the hanging plates (6) are arranged on the left side and the right side of the connecting plate. A vertically adjustable inserting part is arranged on the screw and matched with the connector of a wall so that the position of a board can be adjusted vertically and laterally during the board fixing process.