The breeze leaf device of the wind power system that the invention provide, includes the breeze leaf, rotate shaft, cannula, generator and adopt the perpendicular axis type, the breeze leaf presents a long form, the cross section adopt the NACA0009 wing type, breeze leaf is parallel with the shaft axis line in its length, the string perpendicularity toward the shaft axis line by the length direction, through the conjunction of horizontal beam and shafts, need not to change the windmill direction according to the direction of wind, the space take up is small, the noise is small; the Breeze leaf is solid to become the type adoption the macromolecule compound material, the shaft adoption carbon steel material to manufacture, the contact installation adopt the aluminum metal alloy material, which have good and enduring, anti-causticity, safety, applicably to the temperature changing from minus 55 deg.C to plus 70 deg.C in land, deserts, follow various bad environment of the region of etc. of sea, such as sand dust, salt fog, damp weather etc., enduring time is 20 years long.