The invention discloses a method for improving the efficiency of a visible light response doping-type M-TiO2/AC photocatalyst, comprising the following steps of: taking granular active carbon, pickling with chlorohydric acid and washing with water, and drying for later use; dipping the granular active carbon for 4-10h at 100-300 DEG C by taking phosphoric acid as a chambering agent; then activating under N2 protection, wherein the temperature rise speed is 5-15 DEG C/min, and the activating temperature is 600-900 DEG C; cooling to room temperature after the activation is ended; then pickling with the chlorohydric acid and washing with water to be neutral, and preparing modified activated carbon (AC); according to the conventional method, adding TiO2, metal M oxides or sulphate to mixed liquor of distilled water, glacial acetic acid and absolute ethanol under stirring to form a solution; slowly dripping the solution to an ethanol solution of tetrabutyl titanate; then adding carrier activated carbon; and loading two times to obtain the doping-type M-TiO2/AC photocatalyst. Under visible light, the photocatalysis degradation of the photocatalyst on gas-phase toluene can reach 99 percent.