Positioning and buckling-preventing device for fatigue test of plate-shaped material

The utility model relates to the technical field of industrial product fatigue performance testing, and discloses a positioning and buckling-preventing device for a plate-shaped material fatigue test, which comprises two buckling-preventing pieces, a fastening piece and a positioning unit, the number of the buckling-preventing pieces is two, the two buckling-preventing pieces are attached to each other and are connected through the fastening piece, and the positioning unit is connected with the buckling-preventing pieces through the fastening piece. Each anti-buckling piece is provided with a lubricating piece positioning groove, the anti-buckling pieces and the lubricating piece positioning grooves are I-shaped, lubricating pieces are arranged in the lubricating piece positioning grooves, extensometer positioning grooves and central screw holes are formed in the anti-buckling pieces on the sides away from the lubricating piece positioning grooves, and fixing rods are detachably connected in the central screw