Abstract: Olive pomace activated carbon(OP-AC) from olive pomace(OP) was prepared by high temperature calcination in a resistance furnace at 550 ℃ with KOH as activator, and its adsorption performance for methylene blue(MB) in water was investigated. The optimum parameters of OP-AC preparation were the ratio of 20% KOH to OP charcoal powder(impregnation ratio) was 2.5∶1(mL∶g), impregnation time of 4 h and activation time of 20 min. Under these conditions, when the dosage of OP-AC was 0.6 g, the pH value of water was 13, the shaking time was 15 min, and the MB initial mass concentration was 10 mg/L, the removal rate of MB could reach 99.3%.The OP-AC was characterized by scanning electron microscope(SEM), Fourier transform infrared(FT-IR) and pore size analyzer. The analysis showed that there were multiple oxygen-containing functional groups on the surface of the sample. The specific surface area of OP-AC was 278.832 m²/g, the average pore size was 1.889 nm, the total pore volume was 0.131 cm³/g, and the proportion of micropores was 79.42%. There were many functional groups on the surface of OP-AC samples. The kinetic analysis showed that the adsorption of MB in water by OP-AC was consistent with the quasi second-order kinetic model(R² > 0.99), and the adsorption isotherm was better fitted by Langmuir model(R²>0.93). After 3 cycles of use, the removal rate of MB by OP-AC was still as high as 83.1%. After 6 cycles, the removal rate was still 68.6%.