A rotary-table game machine composed mainly of a rotary-table device and an index device, the rotary-table device has a rotary table rotated by a first motor; the index device has three index pins arranged to space equiangularly and rotated by a second motor. When in operation, the first motor and the second motor make the rotary table rotate reversely against the index pins; and when in stopping rotation, the three index pins point three different division areas at the periphery of the rotary table. By providing a main control board and a sensing plate in the rotary table, a result is show on a display. Thereby the rotary-table game machine can provide variant ways of playing, the odds of winning are increased; and fun of playing can be increased too.