Disclosed are a poker machine and a card collating device (6) and method thereof. The card collating device (6) includes a card collating base (602), a card collating channel outer side wall (603), and a center rotating disc (606), wherein the card collating base (602) is directly or indirectly fixed on a base (1), the center rotating disc (606) is arranged in the center of the card collating base (602), the center rotating disc (606) is driven by a rotating disc electric motor (609) to rotate, the card collating channel outer side wall (603) is arranged outside the card collating base (602), an arc-shaped card collating channel for collating playing cards is formed between the center rotating disc (606) and the card collating channel outer side wall (603), the bottom of the arc-shaped card collating channel is provided with a plurality of conveying rollers (605), one end of the arc-shaped card collating channel is provided with a card discharging baffle (607), a card collating channel outlet (610) is formed between the card discharging baffle (607) and the bottom of the arc-shaped card collating channel so as to allow the playing cards to be dealt out in a lengthwise direction of the playing cards, and a storage box (41) of a dealer (40) is located below the card collating channel outlet (610) for receiving the dealt playing cards. The poker machine can automatically collate disordered playing cards in a coincident direction and deal out the playing cards, automatic and efficient card collating is realized, and various main device components are reasonable in arrangement, compact in structure and high in space utilization.