The utility model relates to a teaching field, concretely relates to instrument is used in chinese language and literature teaching, supporting seat bottom fixedly connected with stand, the articulated connecting rod that has rotates on the supporting seat, the terminal rotation of connecting rod articulates there is the display screen, connecting rod bottom fixedly connected with rack, the hack lever joint is in the tooth's socket of rack, the first last both ends of hack lever are rotated and are cup jointed in rotating the seat, and fixedly connected with anticreep ring, both ends are equipped with the locating plate about the connecting rod bottom, be equipped with the spiral shell axle on the locating plate, the epaxial nut that is equipped with of spiral shell, the nut both sides areequipped with the butterfly changes the board, open the side of supporting seat has the slot, install the USB plug in the slot, the top of slot is equipped with the round pin axle, the baffle rotatesto cup joint is selling epaxial, be equipped with the handle on the baffle, the fixed block is located the slot below, and with supporting seat fixed connection, install magnet on the fixed block, magnet can adsorb the baffle.