The invention discloses an adjustable paper feeding device for a wide-format scanner. The adjustable paper feeding device is characterized in that the adjustable paper feeding device for the wide-format scanner comprises a paper feeder; the paper feeder comprises a disc-shaped fixed disc head which is provided with three rod-shaped paper feeding rollers; the paper feeding rollers are uniformly arranged in the circumferential direction of the fixed disc head; the center of the fixed disc head is provided with a rotating circular hole which is internally provided with a detachable bearing seat; an adjusting screw penetrates through the rotating circular hole and the bearing seat; and the head of the adjusting screw is provided with a detachable adjusting turntable. When a user requires adjustment in use, the adjusting turntable can be rotated. A user can adjust the position of a positioning disc seat on the paper feeding rollers according to the width of paper, and furthermore the position of the positioning disc seat is fixed by means of a positioning nut. The adjustable paper feeding device for the wide-format scanner is suitable for feeding operation of various kinds of paper and furthermore greatly expands application range of the wide-format scanner.