The present invention relates to a cerclage atrial defibrillator, and more particularly, is for treating mitral valve regurgitation and atrial fibrillation by reducing the size of the left atrium through a cerclage wire and treating residual atrial fibrillation by including a defibrillator lead. In order to achieve the above obj ective of the present invention, the cerclage atrial defibrillator includes: a cerclage wire； a coronary sinus tube provided with a lumen formed therein into which the cerclage wire is inserted, the coronary sinus tube being inserted into the coronary sinus； a tricuspid valve tube provided with a lumen formed therein, the tricuspid valve tube traversing the tricuspid valve and protecting the tricuspid valve and tissue of the interventricular septum； a pacemaker lead having an end thereof inserted into the bundle of His； and a defibrillator lead inserted into the coronary sinus tube to treat atrial fibrillation.
