Automatic positioning device

The utility model provides an automatic positioning device, it includes support frame and positioning mechanism, positioning mechanism includes the mounting panel, the loading board, the centre gripping driving piece, two connecting plates, two first splint, sliding plate and two second splint, the mounting panel is equipped with first spout and second spout, the loading board is located on the mounting panel, two connecting plates are connected to the centre gripping driving piece, every connecting plate is first splint respectively, locate in the second spout sliding plate slidable, its oneend is connected in first splint, be equipped with two at least chutes on the sliding plate, per two chutes set up along second direction symmetrically obliquely, every second splint includes the connecting piece, sloping block and plate body, two plate bodys are located the both sides in addition of work piece, the plate body is connected to the connecting piece, and be connected with the slopingblock, every sloping bloc