The poly(acrylic acid)/graphene oxide (GO) composite hydrogels (PAA/GO-PulDA) with homogeneous structure was synthesized by the radical copolymerization between acrylic acid (AA) and Pluronic F127 diacrylate (PulDa) dispersive graphene oxide (GO-PulDA). The GO-PulDA colloid was used as an enhancer in the composite hydrogels. The effect of the concentration of corsslinker N,N'-methylenebisacrylamide (BIS) and GO in composite hydrogels and the solution pH on the strength, hydroscopicity of composite hydrogels and the adsorption capacity for methylene blue (MB) were investigated in detail. The adsorption-desorption properties of the composite hydrogels were tested. The results show that the strength of composite hydrogels can be tailored by controlling the concentration of BIS or GO in the hydrogels. The breaking strength of composite hydrogels increased from 5.0 kPa to 10.4 kPa with increasing the concentration of GO, and the elongation at break was greater than 100 %. The composite hydrogels exhibited pH-sensitive high hydroscopicity, and the increment of swelling ratio (SR) of composite hydrogels was 386 g/g with increasing the solution pH from 3.0 to 6.8. The maximum swelling ration was 490 g/g in pH 6.8 solution. The composite hydrogels exhibited obvious pH-sensitive adsorption properties for methylene blue. The increment of adsorption capacity (qe) of composite hydrogels for methylene blue was 1400 ~ 1500 mg/g with increasing the solution pH from 3.0 to 11.0. The maximum adsorption capacity was 1789 mg/g in pH 11.0 solution. The composite hydrogels displayed excellent regenerated and reused performance. The adsorption capacity for MB retained more than 60 % and the efficiency of desorption was larger than 90 % after five adsorption-desorption cycles.