The utility model discloses an accurate temperature adjusting device behind a converter. The device is arranged on a furnace rear refining platform. The device comprises a low-position stock bin, a belt conveyor, a high-position stock bin, a weighing bin and a rotary chute, the conveyed steel stub bars are guided into the belt conveyor through the low-position stock bin and enter the high-positionstock bin through the belt conveyor, the steel stub bars enter the weighing bin through the high-position stock bin, the steel stub bars which need to be weighed according to the temperature adjustment requirement enter the rotary chute device, and the steel stub bars enter the steel ladle through the rotary chute of the temperature adjustment chute to achieve accurate temperature adjustment of molten steel. According to the utility model, the temperature after argon can be safely, quickly, efficiently and accurately adjusted in the process of argon blowing refining behind the converter aftertapping of the converter, so that the temperature adjusting time is shortened from 3 minutes before improvement to 1 minute while the labor intensity of workers is greatly reduced. Besides, due to the design of the rotary chute, the problems of softening, no collision resistance and the like caused by long-time baking of high-temperature molten steel of the temperature adjusting chute can be avoided, and the service life of the chute is prolonged to more than one year.