An artificial heart valve prosthesis includes a stent comprising at least two commissures spaced circumferentially around the stent, the commissure provided with a first window and a second window, which are arranged along an axial direction of the stent, the first window located closer to an outflow end of the stent; and at least two leaflets arranged circumferentially around the stent, each of the leaflets including a main segment and flaps arranged on opposite circumferential sides of the main segment, the main segment disposed on an inner side of the stent, the flap passed through the second window and covering at least a part of an outer surface of the commissure, the flap sutured at the first window and the second window.