Paper placing platform device on scanner

The invention discloses a paper placing platform device on a scanner, which comprises a paper placing panel, wherein a first paper blocking plate is arranged on one side of the paper placing panel; a second paper blocking plate is arranged on the other side of the paper placing panel; a first rack connected with the first paper blocking plate is arranged on the back face of the paper placing panel; a second rack connected with the second paper blocking plate is arranged on the back face of the paper placing panel; a damper is arranged on the back face of the paper placing panel; a shell of the damper is fixedly connected with a first gear; an inner shaft of the damper is fixedly connected with a second gear; the first gear is meshed with the first rack; the second gear is meshed with the second rack; the first paper blocking plate and the second paper blocking plate are each provided with a locking piece; and a third rack fixedly connected with the locking pieces in a matched mode is arranged on the back face