The invention relates to a three-phase reactor of a rotary flow bubble tower. The three-phase reactor comprises a reactor barrel body, an air blower, an outer circulation device and an ejector, wherein an air outlet pipe is arranged at the top of the reactor barrel body; an air inlet pipe, a liquid inlet pipe, a liquid outlet pipe, a manhole and a mud discharging pipe are arranged on a side wall of the reactor barrel body; a foam removing device, a central circulation pipe, a reflection flow guide plate and a mud bucket are arranged in the reactor barrel body in sequence from top to bottom; a spiral flow guide blade is arranged between an inner wall of the reactor barrel body and the central circulation pipe; a micro-hole air distribution device is arranged between the bottom of the central circulation pipe and the reflection flow guide plate; the bottom of the mud bucket is communicated with the mud discharging pipe; the liquid inlet pipe stretches into the central circulation pipe; the air blower is communicated with the micro-hole air distribution device through the air inlet pipe; the air blower is communicated with the liquid inlet pipe through the ejector; the outer circulation device is communicated with the ejector; the liquid outlet pipe is communicated with the outer circulation device. The three-phase reactor of the rotary flow bubble tower has the advantages that the utilization rate of carbon dioxide can be improved and large-grain manganese carbonate can be effectively precipitated and removed.