Small and medium-sized vertical axis wind turbine

The invention discloses a small and medium-sized vertical axis wind turbine. The small and medium-sized vertical axis wind turbine comprises a perpendicularity adjusting device, a foundation, a tower,a power generator and a spindle, and the foundation, the tower, the power generator and the spindle are sequentially and vertically mounted from bottom to top. Vertical blades are evenly distributedaround the spindle, and the blades are in semicircular cylinder fish-ridge-imitated wing types. Horizontal long-strip-shaped air inlet holes are formed in the blades in the vertical direction at equalintervals, small blades in one-to-one correspondence with the air inlet holes are arranged on the concave sides, and the small blades are connected with the blades in a vertical swing manner and arealigned to the air inlet holes in a natural state. The perpendicularity adjusting device comprises an adjusting disc perpendicularly mounted on the tower, a horizontal sensor arranged on the adjustingdisc, upper tensioning mecha