The invention provides an axially split pump which comprises a pump body, wherein the pump body comprises an impeller, a pump shell and a refluxing structure, wherein the pump shell comprises a suction passage, an accommodating space and an exhaust passage which are arranged in sequence; the impeller is arranged in the accommodating space; the suction passage is vertical to the axis of the axially split surface of the axially split pump and extends from the bottom surface of the pump shell along a direction away from the pump shell; the exhaust passage is arranged at a first side surface of the pump shell and extends from the first side surface along a direction away from the first side surface; the refluxing structure is used for communicating the bottom of the exhaust passage with the suction passage. The axially split pump is capable of better avoiding the static erosion problem of the pump shell and the impeller after termination of pumping; in addition, liquid in the accommodating space completely flows out after halt, so that the anti-freezing effect is relatively ideal.