The invention relates to a toxic volatile organic compound processing technology of a novel aerobic granular sludge reactor and a device thereof; the processing device comprises an air inlet system, an aerobic granular sludge reactor, a water inlet and exhaust system and a time programmable controller; the device adopts a batch operation mode sequentially; firstly, aqueous solution with nutrient elements is pumped in the aerobic granular sludge reactor 10 to the designated water level by a water inlet pump 16, and then an exhaust gas solenoid valve 2 is started, the exhaust gas is carried by air flows of an air pump 4 or enters in the aerobic granular sludge reactor 10 directly, in the reactor, the toxic volatile organic compound in the exhaust gas is purified and adsorbed by the aqueous solution and finally is degraded and removed by the aerobic granular sludge, and the processed exhaust gas is discharged through a gas outlet; after the reaction is finished, the exhaust gas solenoid valve 2 is closed down, the reactor carries out precipitated, and water is discharged, and the whole operating process is controlled by the time programmable controller 18. The aerobic granular sludgereactor in the invention is used for processing the toxic volatile organic compound exhaust gas and realizes high-efficiency removal of the volatile organic compound in the exhaust gas.