The invention relates to a supercritical carbon dioxide banburying device. The supercritical carbon dioxide banburying device is characterized in that a carbon dioxide tank is included; the outlet end of the carbon dioxide tank is connected with the inlet end of a booster pump; the outlet end of the booster pump is connected with the inlet end of a first heat exchanger; the outlet end of the first heat exchanger is connected with an inlet of an internal mixer; a top air outlet of the internal mixer is connected with the inlet end of a filter; the outlet end of the filter is connected with the inlet end of a carbon dioxide compressor; the outlet end of the carbon dioxide compressor is connected with the inlet end of a second heat exchanger; and the outlet end of the second heat exchanger is connected with the carbon dioxide tank. A first valve is arranged between the outlet end of the carbon dioxide tank and the inlet end of the booster pump. A second valve is arranged between the outlet end of the booster pump and the inlet end of the first heat exchanger. A bottom rubber discharging opening of the internal mixer is connected with an open mill. According to the supercritical carbon dioxide banburying device, the problem of dispersion of filler, especially white carbon black or mediate-superstructure carbon black or superstructure carbon black, in the prior art is solved.