Vertical pipeline centrifugal pump

The invention belongs to the technical field of centrifugal pumps, and particularly relates to a vertical pipeline centrifugal pump which comprises a motor seat frame, a first pump section, a second pump section and a supporting base, a water outlet pipe is arranged on one side of the second pump section, a water inlet pipe is arranged on one side of the supporting base, and a center shaft is inserted into the top end of the motor seat frame and sleeved with a first impeller. A mechanism for preventing the center shaft from being eccentric is arranged in the water outlet pipe, the mechanism for preventing the center shaft from being eccentric comprises a pair of clamping rods, clamping parts are arranged at the inner ends of the clamping rods, a pair of fixing seats is fixed to the lower edge of a water inlet of the water outlet pipe, and a main shaft is fixed to the fixing seats. According to the device, water flow generates continuous pushing force on the mechanism for pushing the outer ends of the clamping