A related method for processing reverse-osmosis concentrated water through catalytic ozone oxidation: dipping peanut shell powder in a phosphoric acid solution with the concentration of 60% according to the solid-liquid ratio of 1:1-1:3, transferring the material solution to a crucible for activation, cooling, washing with a hydrochloric acid solution with the concentration of 1%, washing with deionized water to get a pH value of 7, putting in a baking oven, baking at 105 DEG C to obtain a constant weight, performing grinding or ball-milling crushing and screening; dipping peanut shell activated carbon in a transition metal ion solution with the mass concentration of 0.1-10% according to a solid-liquid ratio of 1:1-1:10, baking to dry, roasting and grinding; adding into an ozone oxidation sewage processing system containing the reverse-osmosis concentrated water, and controlling the ozone oxidation sewage processing temperature to be 5-35 DEG C; and after processing is finished, separating out the peanut-shell-active-carbon-supported metal ion catalyst for next time of the catalytic process. The catalyst employed in the method is abundant in channel, large in specific surface area and more in surface active group, and has relatively strong adsorption and catalytic effects on organic pollutants in sewage.