a plurality of lift-type vertical blades arranged at fixed intervals around a vertical main shaft of a vertical shaft rotor, wherein each of the plurality of lift-type vertical blades has a substantially vertical main portion and upper and lower inward circular arc-shaped portions that are respectively and continuously formed from a top and a bottom of the substantially vertical main portion to respectively elongate toward the vertical main shaft, a tip portion of the upper inward circular arc-shaped portion is fixed to a fixing portion of an upper blade fixture arranged on the vertical main shaft, and a tip portion of the lower inward circular arc-shaped portion is fixed to a fixing portion of a lower blade fixture arranged on the vertical main shaft;

wherein the vertical-shaft wind turbine further comprises a support frame body which is framed with horizontal frame bodies horizontally arranged in upper and lower stages and a plurality of support poles, and a generator which is horizontally arranged in each plane central portion surrounded by inner frames respectively provided in the horizontal frame bodies,

wherein an upper generator arranged in the upper horizontal frame body has a rotation shaft vertically protruding downward from a lower surface of the upper generator, a lower generator arranged in the lower horizontal frame body has a rotation shaft vertically protruding upward from an upper surface of the lower generator, upper and lower end portions of the vertical main shaft of the vertical shaft rotor are respectively coupled with a lower end portion of the rotation shaft vertically protruding downward from the upper generator and an upper end portion of the rotation shaft protruding upward from the lower generator thereby forming a seam between the vertical main shaft and the respective rotation shafts of the upper and lower generators, such that the vertical main shaft of the vertical shaft rotor is concentrically and directly connected between both rotation shafts of the upper and lower generators, and

wherein an outer peripheral side of the seam between the vertical main shaft and the respective rotation shafts of the upper and lower generators is sheathed with a covering body for preventing decoupling; and

wherein upper and lower end portions of the vertical main shaft of the vertical shaft rotor are respectively coupled and supported between both rotation shafts of the upper and lower generators without using bearings so as to be concentrically and vertically aligned and move cooperatively to reduce torsion and vibration when rotating.