The invention discloses a method and a device used for mitral regurgitation treatment device, and comprises a treatment providing device. The treatment device comprises an expandable frame and a leaf assembly accommodated in the frame. The frame is provided with a canopy frame assembly. The treatment device is conveyed to the aorta position of the aortic valve of the patient, and the frame is expanded in the natural aortic valve leaf position, and at the same time, the canopy frame part is used to push the aorta lower septa and/or the front leaf and/or the mitral ring of the mitral valve toward the direction of the mitral valve. The leaf assembly is used to replace the leaf function of the natural aortic valve of the patient.
