The invention discloses a heart rhythm demonstration model capable of adjusting beating rhythm in the technical field of heart beating models, which comprises a ventricular cavity cover, a closed cavity with a ventricular shape outside, a plurality of ventricular elastic strips uniformly and fixedly connected to the inner wall, and a ventricular limiting shaft fixed inside, one end of each ventricular elastic strip is fixedly connected with the ventricular limiting shaft, a ventricular contraction and expansion wheel is rotatably mounted on the ventricular limiting shaft, the other ends of the ventricular elastic strips are fixedly connected with the ventricular contraction and expansion wheel, the rhythm of heartbeat can be simulated, and contraction and expansion of ventricles and atriums of the heartbeat can be displayed, meanwhile, the atrial and ventricular beating at different frequencies can be displayed, the heartbeat of different arrhythmias can be simulated, the arrhythmias can be visually simulated and displayed, the heartbeat rhythm of the arrhythmias can be displayed at different atrial and ventricular beating frequencies, the manufacturing is simpler, the display is more visual, and the carrying is more convenient.