The design concept and technical core of the vertical multi-stage submerged semi submersible long shaft deep well turbine pump revolve around the core goal of "stable water delivery with high head in deep wells", and an engineering system consisting of four pillars: segmented long shaft transmission, multi-stage centrifugal boosting, axial force balance, guide bearing support, and downhole sealing. The design logic of the vertical multi-stage underwater semi submersible long shaft deep well turbine pump follows the industrial principles of "structure maintainability, high reliability operation, and high efficiency and energy saving".