The development and application of hydrogel can provide potential solutions in reducing pollution and treating industrial wastewater effectively and sustainably. Especially those hydrogels with biodegradable components such as PVA, a non-toxic polymer, and lignin, a natural biomass substance are familiar and popular 17-19.In this work, the hydrogel adsorbents from polyvinyl alcohol and lignin were synthesized. The glyoxal as crosslinker for the hydrogels was utilized to create three-dimensional network for the hydrogel. The adsorption capacity of these prepared hydrogels for MB was studied by Langmuir and Freundlich adsorption isotherms. The characterization of the hydrogel was investigated by FTIR, SEM, and UV-Vis.