The invention relates to a method for controlling the strip shape of CSP hot-rolling extremely-thin color-coating base material. The method comprises the following steps that the convexity and the wedge degree of the CSP hot-rolling extremely-thin color-coating base material are selected, wherein the convexity is 40+/-20 microns or 45+/-20 microns or 50+/-20 microns, and the wedge degree is less than or equal to 20 microns; high/concave points of the transverse section of strip steel are evaluated, wherein evaluation is conducted through thickness difference values of the strip steel on the transverse section perpendicular to the rolling direction and in the section with the boundary +/-200 mm away from two sides of the middle point; outside the section with the boundary +/-200 mm away from the middle point, local high/concave points which are higher/lower than the outline datum line of a strip steel board are evaluated. The control ability for the strip shape of a unit can be fully excavated, and production stability of the thin color-coating base material is greatly improved. The invention further discloses a technology for controlling indexes of the strip shape of the ma steel hot-rolling CSP color-coating base material. The technical requirements for indexes of the convexity and the wedge degree of the color-coating base material of different thickness specifications are definite, technological innovation is conducted on the local high (concave) evaluation mode and the technical requirements of the transverse section of the strip steel, outline quality of the strip steel board is measured more scientifically and accurately, and therefore the defects of middle ridges and middle narrow waves of the color-coating base material are overcome, quality of color-coating products is improved, and quality loss of the products is reduced.