A liquid outlet connecting pipe structure of a low-temperature immersed pump is characterized in that a centrifugal pump comprises an upper casing and a lower casing; the upper casing comprises a downward first contact surface; the lower casing comprises an upward second contact surface; at least three hollow cylindrical flow channels distributed circumferentially and evenly are arranged between the upper casing and the lower casing; two ends of each flow channel are fixedly connected on the first contact surface and the second contact surface separately in a sealed manner; sealing layers arearranged between flow channel end surfaces and the contact surfaces; liquid outlet channels are arranged at joints of the first contact surface and the flow channels; and liquid inlet channels are arranged at joints of the second contact surface and the flow channels. The structure has the advantages of simplicity, convenience in machining and mounting, good sealing effect and reliability in running.