The invention discloses a treatment device for tar which is an organic compound. The treatment device comprises a tar collecting tank, a spraying preheating tower, a fractionating tower and a tar combustion furnace. The tar collecting tank is connected with a preheating plate in the spraying preheating tower by a tar inlet pipe, a spraying pipe is connected with the top of the spraying preheating tower, a pipe type water heater is connected with the spraying pipe connected with a hot water spray nozzle, and the spraying preheating tower is connected with the fractionating tower by a hot oil pipe; an arc-shaped heating plate, filler plates, sampling branch pipes and hot water inlet branch pipes are arranged in the fractionating tower, and alkali liquor treatment devices are connected with the tops of the fractionating tower and the tar combustion furnace. The treatment device has the advantages that spraying preheating and heating fractionating are carried out on the tar which is the organic compound before the tar is combusted, useful low-boiling-point components in the tar can be rectified, low-boiling-point fraction generated by means of purification can be recycled to be fed on production lines, accordingly, the tar which is the organic compound can be recycled, and wastage can be prevented; the treatment device is additionally provided with tail gas treatment devices, accordingly, environmental hazards can be reduced, and green and environmental protection requirements can be met.