External insulation board for external wall and manufacture method thereof

The invention discloses an external insulation board for an external wall, which has the product shape of a board. The external insulation board for the external wall comprises a panel, wherein the back of the panel is subjected to cold-pressing compounding with an antiflaming board or a non-inflammable insulation board; the panel comprises the following raw materials according to parts by weight: 31-34 parts of cement, 32-39 parts of coal ash, 4-7 parts of quartz powder, 2-5 parts of paper pulp, 9-14 parts of inorganic fiber, 4-9 parts of lime, 1-3 parts of addition agent and 1-3 parts of compound active exciting agent. The steps of burdening and stirring raw materials and shaping a product are all finished in a manufacturing shop to guarantee the homogeneity and the evenness of the board and avoid external environment influence, the problems of the fissure and the hollowing of a facade can be solved, and the situations of seeping water, dropping and losing an energy-saving insulation effect are prevented so as to effectively prolong the service life of a building.