The invention relates to a scanning device, and particularly relates to a quick scanning device of identity cards. A transmission device is arranged in a casing, wherein the transmission device comprises two driving rollers that are arranged in parallel at an interval, the outer edges of the two driving rollers are commonly sleeved with a transmission belt, a plurality of rectangular through holes are uniformly formed in the transmission belt at intervals, a bump is separately prepared on the surfaces of the transmission belt corresponding to four corners of each rectangular through hole, the inner edges of four bumps of each rectangular through hole form a caulking groove, the size of the caulking groove is adapted to the size of the identity card to facilitate the embedding of the caulking groove, a U-shaped frame is arranged in the casing located by the side of the transmission belt, the U-shaped frame comprises an upper mounting plate and a lower mounting plate that are arranged in parallel to each other at intervals, a light-sensitive lens is separately arranged at the corresponding locations of the lower end surface of the upper mounting plate and the upper end surface of the lower mounting plate, a gap is formed between the two light-sensitive lenses, and the gap is used for accommodating the transmission belt to pass through.