A force sensing mechanism of the massage machine contains: a frame, a swing seat, a connecting member, and at least one sensing apparatus. The frame includes a rotary shaft fixed thereon and displaces vertically on a second sliding rail of a massage chair. The swing seat is connected with the rotary shaft and includes at least one roller. A first end of the connecting member is coupled with the swing seat, and a second end of the connecting member is connected with a first end of the stopping member, a second end of the stopping member is coupled on the frame. The at least one sensing apparatus is arranged on the frame relative to the stopping member so as to sense a movement of the stopping member, and the sensing apparatus is connected with a controller to transmit a sensing signal toward the controller so that the controller calculates a massage force of the at least one roller.