A lift mechanism of a tile-based game machine is installed on a table. The lift mechanism includes a lift plate. One end of the lift plate is coupled to the table, and another end of the lift plate is a movable end. The movable end of the lift plate is provided with a door, and the door is provided with a restoring spring. A lift bracket is provided under the lift plate. A crank is provided under the lift bracket to cooperate with the lift bracket. An electric motor is connected with the crank. The present invention has a simple configuration and the tiles can be ascended quickly and the failure rate is low.