With the deepening of research on the military stealth, solar energy conversion, laser heat treatment and other technologies, the technical requirements for surface absorption films are continuously improved. In order to meet the requirements of solar spectrum absorption, a novel optical film with strong absorption in the 400-2500 nm band is developed, which is applicable to multiple kinds of substrate. The absorption structure model is established based on the absorption theory, and the design of the absorption film is realized by combination of the characteristics of the materials. The solar spectrum strong absorption film is prepared based on the vacuum ion-assisted deposition technique and the fractional deposition process optimized by the reverse inversion method. The test results show that the average absorptance of the absorption film is 98.15% in the range of 400-2500 nm. The prepared absorption films can meet the requirement of mechanical fastness and have better adhesiveness to the substrate.