Positioning device for wood board drilling

The invention discloses a positioning device for wood board drilling, which is used for positioning while drilling a wood board. The positioning device comprises a clamp body, wherein intersected horizontal hole and vertical hole are formed in the clamp body; a drive rod is connected in the vertical hole in a sliding manner; a boosting cylinder is connected to a drive end of the drive rod; a driven end of the drive rod is positioned at the juncture part of the horizontal hole and the vertical hole; an inclined plane is arranged at the driven end; a tension rod is axially connected in the horizontal hole in the sliding manner; idler wheels which are matched with the inclined plane on the drive rod are arranged on the tension rod; the bottom part of the tension rod is connected with the clamp body through a spring; and threaded holes are formed in the head of the tension rod and are in threaded connection with clamping jaws. The boosting cylinder can generate relatively strong drive force, so that clamping is relatively stable; and the contact between the idler wheels and the inclined plane is relatively tight due to the spring.