Abstract: Activated carbon/expanded graphite (AC/EG) composite was prepared by impregnation activation process using fructose as precursor and phosphoric acid as activating agent. The microstructure and adsorption capacity to Rhodamine B of the composite were studied by using X-ray diffraction, scanning electron microscope, nitrogen adsorption-desorption tester, Fourier transform infrared spectroscope and ultraviolet-visual spectrophotometer. The formation mechanism of AC membrane was discussed. The results show that the good flowability of fructose as precursor was the key factor for achieving the EG coated with AC membrane. AC/EG composite had features of hierarchical porous and pores connected with each other. The specific surface area and mesopore volume of composite were both the largest which were 863.34 m²·g^-1 and 0.396 cm³·g^-1, respectively, and the adsorption capacity to Rhodamine B was 626.12 mg·g^-1 when the mass of added phosphoric acid was 7.2 g, activation temperature was 500℃ and activation time was 2 h.