The invention discloses a beating device for simulating a heart. The device comprises a transparent colloid heart model and an adjustable pressure container, and is characterized in that the heart model is provided with a left atrium, a left ventricle, a right atrium and a right ventricle, wherein the left atrium, the left ventricle, the right atrium and the right ventricle are each provided withan auxiliary observation mechanism. Circulating oil is injected into the adjustable pressure container. A mitral valve opening adjusting mechanism is arranged on the heart model, a tricuspid valve opening adjusting mechanism is arranged on the heart model, and oil body pointing mechanisms are arranged in the left atrium, the left ventricle, the right atrium and the right ventricle. According to the invention, the blood supply details of the heart model under different conditions can be intuitively understood, so that a better teaching effect is achieved.