The invention relates to a wind turbine, which makes use of gentle breeze to transform wind energy into electric energy so as to fit power usage in city, country and family in mountain area or do as the compensation of power usage in family. It comprises generator, vane and taper tube. The taper tube comprises inner taper tube (7) and outer taper tube (4), which are mated in mutual inversion. Multiple spiral guiding plates (6) collocated on the axis are used to connect the inner taper tube (7) and the outer taper tube (4). The generator is set in the inner taper tube (7). Hub (9) with vanes (8) is set on the shaft of generator (11). Vanes are set at the outer part of big head end of inner taper tube (7) and the inner part of small head end of outer taper tube (4). The outer taper tube is set on the support bar (2) and can rotate on the support bar (2) freely.