An automatic shuffling machine has a shuffling wheel and a card input mounted adjacent to the shuffling wheel for conveying and inserting cards into slots formed in the shuffling wheel. An insertion panel is mounted securely between the card input and the shuffling wheel, may be a curved shape corresponding to the shuffling wheel and has a tangent surface opposite to the shuffling wheel and an abutting portion disposed between an inlet passage of the card input and one corresponding card slot of the shuffling wheel. Thus, by controlling the rotation of the shuffling wheel, the automatic shuffling machine input the cards in a simple and efficient manner.