Novel anti-turn-back flapping door machine core

The utility model discloses a novel turn-back prevention flapping door machine core which comprises a gate machine body and a locking positioning mechanism, a machine core transmission shaft is installed on the inner side of the gate machine body, a door plate positioning seat is installed on one side of the middle of the machine core transmission shaft, a flapping door plate is installed on the inner side of the door plate positioning seat, and the door plate positioning seat is arranged to be a U-shaped alloy seat. According to the flap gate, the door plate positioning seat is arranged to be a U-shaped alloy seat, and the three side edges of one side of the flap door plate are clamped in the positioning grooves of the door plate positioning seat, so that the flap door plate mounting structure is high in stability; and multiple side edges of the outer sides of the flapping door plates can be protected, the use safety of the flapping door plates is improved, the locking and positioning mechanisms are mounted