A automatic dice shaking method includes the step of a) positioning a dice seat of a dice box on a plane, b) joining a dice cup of the dice box to the dice seat, c) shaking the dice box in which a plurality of dice are contained, d) positioning the dice seat with which the dice cup is joined on the plane, and e) separating the dice cup from the dice seat. By means of controlling a computer-controlled mechanical arm to run dice shaking and dice cup separating actions automatically, the automatic dice shaking method improves game fairness and helps reduce the personnel cost.