The invention discloses a color fixative for yam slices and a use method thereof. The invention aims to provide a sulfur-free color fixative for yam slices, which is free of sulfur and has favorable effect of color protection, and applications thereof. The invention has the technical proposal that the sulfur-free color fixative comprises phytic acid, citric acid, ascorbic acid and L-Cysteine hydrochloride, wherein the concentration of the phytic acid is arranged from 1.36 to1.69%, the concentration of the citric acid is ranged from 0.37 to 0.79%, the concentration of the ascorbic acid is 0.11-0.255, and the concentration of the L-Cysteine hydrochloride is ranged from 0.21 to 0.26%. Compared with the prior art, the color fixative had the obvious advantages of favorable effect of color protection, and high safety. The invention is used for sulfur-free protection of fresh slices during the processing of yam herbal pieces.