The invention discloses a device and method for achieving photo-assisted electrochemical catalytic oxidation of oil fumes. The device comprises a spray tower shell and an electrolyte circulating system; a fume inlet is formed in the bottom of the spray tower shell, a fume outlet is formed in the top of the spray tower shell, and an ultraviolet lamp and a quartz tube are fixed in the spray tower shell; the electrolyte circulating system comprises an electrolysis reactor, a circulating pump, a material supplementary box and a plurality of spray heads, the electrolysis reactor comprises a positive electrode plate and a negative electrode plate, and a power supply system is connected to the electrolysis reactor and supplies power to the electrolysis reactor; the spray heads are arranged on the top inside the spray tower shell and connected with the electrolysis reactor through a pipeline; the circulating pump is arranged on the pipeline for connecting the electrolysis reactor with the spray heads; the material supplementary box is provided with a feed port and used for supplementing a raw material sodium chloride, and an outlet of the material supplementary box is connected with a pipeline for connecting the electrolysis reactor and the circulating pump. The device has the advantages of being simple in structure, cheap in raw material, low in energy consumption, long in material replacement cycle, free of pollution to the environment and the like.