Abstract: The present invention provides a wind power generator comprising: a case; a first rotor having a first main axis in the form of a hollow shaft rotatably installed within a part of said case, a first main wing, coils or a permanent magnet installed on said first main axis; a first stator having a permanent magnet or coils installed on an inner wall of said case; a first auxiliary wing mounted to an end of a first inner axis which is rotatably installed within said first main axis; a second rotor having a second main axis in the form of a hollow shaft rotatably installed within the other part of said case, a second main wing, coils or a permanent magnet installed on said second main axis; a second stator having a permanent magnet or coils installed on the inner wall of said case; and a second auxiliary wing mounted to an end of a second inner axis which is rotatably installed within said second main axis, wherein said first main wing and said second main wing rotate in rotational directions opposite to those of