The invention relates to a forming die of a double-colored silica gel negative film and the forming method for the film. The die is composed of an upper die, a lower die, a middle plate and a feed plate. The middle plate is positioned between the upper die and the lower die, and the feed plate is above the upper die; wherein, a primary forming die cavity is formed by closing an upper die cavity and a middle plate cavity for forming the light-transmission components of the silica gel negative film; after the middle plate is moved out, the upper die cavity and the lower die cavity are closed toform a secondary forming cavity; and material is fed into the secondary forming die cavity through a feed sprue of the upper die, so as to form shading components distributed around the light-transmission components. By forming two gel materials of different colors on the dies for two times, the invention makes the gel materials of different colors that solidified in sequence be cemented but not permeate each other, thus ensures the color boundary position of the negative film to be clear, therefore the invention can effectively replace the traditional technologies of single color spray coating and laser cutting or blanking after silica gel oil compression forming after TPU thin film printing, greatly lowers the cost and improves the productivity.