Feeding inlet adjustable feeding device of ink printing machine

The utility model discloses a feeding device with an adjustable feeding port of an ink printing machine, which comprises a printing machine shell and a feeding conveying plate, the feeding port is arranged on the outer wall of one side of the printing machine shell, a printing roller is arranged on the inner wall of the feeding port, the feeding conveying plate is arranged in the feeding port, and the printing roller is arranged on the inner wall of the feeding port. A base is installed on the bottom face of the printing machine shell, and a paperboard centering adjusting mechanism is installed on the top face of the feeding conveying plate. The paperboard centering adjusting mechanism comprises a centering clamping part for clamping a paperboard, a driving stretching part hinged to the centering clamping part and used for driving the centering clamping part to move relatively, and a driving component for providing power for the driving stretching part, and a paperboard auxiliary conveying assembly is arrange