A panel jig device for a vehicle may include: a base bracket disposed on a jig base; a motor assembly mounted on the base bracket and including a rotary shaft; a locator having a locator end supporting a holding portion of a panel, connected to the rotary shaft of the motor assembly, and rotating about the rotary shaft with rotation of the rotary shaft; a clamping cylinder including an operating rod selectively operating forward/backward, and hinged to the locator; and a damper having one end hinged to the operating rod, a center portion hinged to the locator, and the other end with a clamping end supporting the holding portion of the panel.