The invention discloses a back beating massager for a patient in a pulmonary function recovery stage after a cardiothoracic surgery. The back beating massager for the patient in the pulmonary functionrecovery stage after the cardiothoracic surgery comprises an arm lever, a motor, a rotating shaft, an eccentric wheel, a piston, a push plate, a first spring, a palm type shell, a heat-insulation cover, a heater, a sliding sleeve, a massaging block, a second spring and a massaging cushion. The back beating massager for the patient in the pulmonary function recovery stage after the cardiothoracicsurgery is skillful in structure and powerful in function, at first, by a lever type labor-saving rapping design, injury of a wrist of a medical worker can be relieved effectively, a rapping effect isfurther improved, the secreta in the body of the patient can be discharged easily, secondly, by an effect of cooperation of electric massage and a heating mechanism, the subcutaneous tissues and blood vessels of a patient can be effectively massaged, blood circulation can further be promoted greatly, the rehabilitation effect for the patient is improved finally, and the back beating massager is suitable for patients who are bedridden, are ill for a long time and become weak, do not have force to eliminate phlegm and the like; and promotion and application of the medical industry are facilitated.