Automatic cover closing device

The utility model discloses an automatic cover closing device capable of closing a flap cover of a bottle cover before demoulding, which comprises a support seat, wherein the support seat is provided with a pre-feed air cylinder, a piston rod of the pre-feed air cylinder is provided with a push-feed air cylinder, and a piston rod of the push-feed air cylinder is provided with an overturn mechanism. After the bottle cover is formed, when the mould is opened, the pre-feed air cylinder pushes the overturn mechanism to the position corresponding to the flap cover of the bottle cover, then an overturn roller is turned upwards, the flap cover is turned diagonally above the bottle cover, and then the push-feed air cylinder works to close the flap cover via the overturn roller pressed on the flap cover, so the labor intensity of operators is greatly relieved, and the production efficiency is increased.