The utility model discloses a spiral -flow type air door structure for boiler burner, including the hydrocyclone fan leaf, the installation end of whirl blade be the rear end, and its characterized in that is equipped with the rectangle opening at the installation end of whirl blade, and the symmetry is equipped with first mounting hole on the whirl blade by the rectangle opening, at the embedded connecting piece that is equipped with of rectangle opening, being equipped with the pivot mounting hole in the connecting piece, being equipped with the parallel key groove at the inner wall of pivot mounting hole, be equipped with inlay groove in the top and the bottom of connecting piece, the connecting piece inlays the dress through inlay groove and in the rectangle opening, is equipped with the second mounting hole corresponding with first mounting hole position on the connecting piece, the connecting piece can be fast and the whirl blade install or dismantle, convenient maintenance, on the other hand guarantees through the connecting piece that the situation such as not hard up of whirl blade can not appear in the pivot of air door executor when rotating and is connected insecurely between the whirl blade that leads to and the executor and is moving the problem that the in -process often broke down, shut down.