In order to master the rule of microstructure evolution of aluminum double zero foil in the process of cold-rolling, the 1235 aluminum alloy foil billet was studied in this paper, the morphology and size change of the second phase of the 7.0 mm thickness cast-rolling foils during the cold working was investigated. The results showed that the homogenization annealing for the first pass rolled cast-rolling foils does not change the property of the second phase, but only changes the phase size to a certain extent, some precipitates θ(FeAl3) dissolve, the morphology of partial θ precipitates tends to grow up to needle-liked shape; and then the needle-liked structures are broken during cold rolling to 1.8 mm, the needle-liked phases are difficult to be further broken after being broken in the range of 5~8 μm, the “hard and brittle”characteristics of the needle-liked second phases is verified, and the importance of controlling the quantity of the second phase with the size larger than 5 μm during annealing is explained.