The invention discloses a preparation method of a shading film. The preparation method includes selecting thermosetting type polyurethane printing ink, adopting intaglio printing equipment, printing the printing ink on the first layer of one side with a film, and curing the film in a circular curing chamber with the set temperature of 50 DEG C for 24 hours after printing to obtain a single-face printed film with a printing ink layer of 1-2 micrometers; repeating the process on the same face or the other face of the single-face printed film, and printing the face for multiple times until the total thickness of the printing ink layer reaches 6-12 micrometers to obtain the shading film. By the preparation method of the shading film, the problem of printing ink melting caused by solvent residues is solved, the thickness of the printing oil layer is uniform, and the problems of shading insufficiency and spots are also solved. The invention also discloses a preparation method of a shading double-sided adhesive tape. The shading film is applied to the shading double-sided adhesive tape. The invention further discloses a solvent-type acrylate pressure-sensitive adhesive which is applied to the shading adhesive tape.