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This paper present the conversion of cellulose based on water hyacinth into hydrogel. The water hyacinth cellulose was prepared using acid-alkaline treatment and bleaching. The cellulose properties was optimized by varying the extraction condition such as solvent concentration and temperature. The analysis method of FTIR and XRD were used for characterizing the functional groups and crystallinity of cellulose. The effective condition of extraction were achieved at solvent concentration 17,5% w/w of NaOH, 8% v/v of H2O2 as bleaching agent and temperature of 80oC. The extracted cellulose was used to produced hydrogels using poly vinyl alcohol and glutaraldehide as crosslinker agent. The research revealed that adding of glutaraldehide with ratio 1:2 at 25oC give the highest water absorption capacity of 285%.