External wall thermal insulation integrated board

The utility model relates to a building material, in particular to an external wall thermal insulation integrated board. The board comprises a decorative surface layer (1) and a thermal insulation layer (2) which are superposed, wherein the contact part of the decorative surface layer (1) and the thermal insulation layer (2) is subjected to high-temperature chemical fusion reaction to form a fusion layer (3). The board has a simple structure, high strength and ageing resistance, is firm, reliable, durable, waterproof and fireproof, is low in manufacturing cost and can be industrially produced according to different size requirements, the decorative surface layer and the thermal insulation layer are integrally bonded by performing chemical reaction on materials and curing at high temperature, other external bonding agents are not used, and labor is saved.