The invention discloses a vane dismounting support base device. The vane dismounting support base device includes a bottom frame, a main support 1, a support groove plate 7, a protective pad 8, and inclined supports 9; the bottom frame is of a rectangle-shaped frame which is horizontally arranged, and the bottom frame are welded and formed by a front horizontal beam 2, a back horizontal beam 3, a left longitudinal beam 5 and a right longitudinal beam 4; a middle horizontal beam 10 is welded at a central position between the left longitudinal beam 5 and the right longitudinal beam 4; the middle horizontal beam 10 is welded with the main support 1 which is vertical upward; and the main support 1 is of a hollow cuboid support which is welded and formed by steel plates. The vane dismounting support base device is reasonable in structure, is safe and reliable in use, can effectively keep balance of vanes, avoid damage to the vanes, and improve the dismounting efficiency of the vanes.