The utility model discloses a do and hang from decorating impervious external wall insulation board comprises panel and heat preservation, and two at least sides of heat preservation are wide to go out corresponding the side 1mm - 20mm of panel, set up impervious arch or impervious recess on the side of heat preservation, have: the heat preservation side is the jam -packed each other, and the structural style of embedding each other between impervious arch on the side and the impervious recess, the effectual people of oozing who blocks water, with the bonding waterproof layer between impervious arch and the impervious recess between the heat preservation side, the flexible filleting cream that imbeds in stitching of the wide board of about 3mm only between the protective layer especially, the further follow material infiltration of stopping water. 2, the mounting means is simple and convenient and firm reliable. The adoption anchor is given first place to, bonds to the mounting means of assisting, and ensureing to keep warm, it is inseparable, firm reliable to combine between protective and the wall body. 3, accomplish wall, the heat preservation protection of board seam, waterproof impervious and wall decoration simultaneously, very big low construction cycle, the reduction operating expenses of shortening.