The invention provides a far-infrared, negative ion, aroma and oxygen therapy combined system. The system comprises a therapy capsule for accommodating a person; and a far-infrared carbon crystal heating module, a water spray negative ion aroma generator and an oxygen and air supply module are arranged in the therapy capsule. The invention also provides a therapy method of the combined system. The combined system of the invention has many beneficial effects such as improving a circulatory system, promoting metabolism, regulating physiological balance, beautifying skin, reducing weight and enhancing immunity and provides residents with a new choice of static aerobic exercise. With the far-infrared negative ion aroma and oxygen therapy combined system and therapy method of the invention adopted, defects such as functional monotony and low absorption rate for a human body of a traditional external therapy method can be eliminated. According to the system and method thereof, far infrared therapy, negative ion therapy, aroma therapy and oxygen therapy are combined, can complement each other' advantages and enable a synergistic effect, and therefore, not only can the effect of each therapy be enhanced, but also a new synergistic effect can be additionally realized, and different needs of the market for therapy machines can be satisfied.