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The sodium lignin sulfonate was grafted into polyacrylamide hydrogel to synthesize polyacrylamide-lignin sulfonate hydrogel. The ammonium molybdate was introduced into the hydrogel network by immersion process to realize vision display. The absorbance, transparency, structure and morphology of sodium lignosulfonate-polyacrylamide hydrogel were measured by UV-Vis, FT-IR and SEM, respectively. The UV-Vis measurement results show that the hydrogel had the advantages of low cost, easy preparation, and excellent performance in quick response within 5 min. In addition, the photochromic and fading processes of hydrogels could be precisely controlled by UV light at different time and temperatures. FT-IR measurements showed that sodium lignosulfonate was successfully incorporated into the polyacrylamide hydrogel. SEM results show that the hydrogel exhibited a dense structure after complete drying, which made the hydrogel less susceptible to fading after photochromism. [ABSTRACT FROM AUTHOR]