An apical implantation mitral valve balloon closure plate blocking body and an implantation method, belonging to the technical field of human heart repair. A balloon closure plate (7) made from an elastic plastic material which may be filled with a gas or a curable liquid is implanted via a small incision on the left side of the chest, enters the left ventricle (3) via the apex (4), and is placed and fixed at a backflow hole position of a front and rear leaflet closure point (5) of the mitral valve (2). During diastole, the mitral valve (2) opens, and blood flows from the left atrium (1) to the left ventricle (3) via two channels between the front and rear leaflets (2.2, 2.3) and the balloon closure plate (7). During systole, the front and rear leaflets (2.2, 2.3) close, and the edges of the leaflets and the balloon closure plate (7) fit tightly together, thereby blocking a backflow channel of the mitral valve (2), and effectively preventing backflow of the mitral valve (2). The balloon closure plate blocking body is simple in structure and highly reliable, the implantation method causes little bodily trauma, and the residual backflow rate is low. The present invention treats diseases such as functional mitral valve regurgitation, and the success rate for repairing functional mitral valve backflow is more than 90%.Linvention concerne un corps servant à bloquer une plaque dobturation à ballonnet de valve mitrale dimplantation apicale et son procédé dimplantation, qui relève du domaine technique de la réparation cardiaque chez lhomme. Une plaque dobturation à ballonnet (7) à base dune matière plastique élastique qui peut être remplie dun gaz ou dun liquide durcissable est implantée par lintermédiaire dune petite incision pratiquée du côté gauche du thorax, pénètre dans le ventricule gauche (3) par son apex (4), et est posée et fixée à une position de trou de reflux du point de fermeture des feuillets avant et arrière (5) de la valve mitrale (2). En diastole, la valve
