A vertical axis wind machine having controllable output power, comprising a wind machine base, and an integrated shaftless circular three dimensional framework having a rigid connection with an annular floating body; blades are installed on the three dimensional framework; the angles of attack of the blades are controlled via a computer; the wind machine base is provided with an annular groove with water; the annular floating body using the rigid connection to support the three dimensional framework is the bottom structure of the wind machine rotating body, and the shape of the annular floating body is consistent with the inner cavity of the annular groove; the angles of attack and lifting force direction of the blades installed on the wind machine can be automatically controlled by computer according to the momentary wind force on the blades; the blades of the wind machine are of a double-sided lift type; the lift-type blades are in the shape of wings, and the front edges thereof are normally in the windward direction, and the rear edges are in the downwind direction.
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