The invention discloses an intelligent online self-cleaning scale-free operating energy-saving device of heat exchanging equipment, relating to a scale removing device of heat exchanging equipment and comprising a controller, a magneto striction transducer, a vibration transmission head and an amplitude transformer, wherein the amplitude transformer consists of an afferent section, a transmissionsection and an efferent section, the afferent section is connected with the magneto striction transducer, the efferent section is connected with the vibration transmission head in which a cavity is arranged, concentric vibration amplification rings with the same center different radiuses are arranged in the cavity, and the vibration amplification ring at the inner ring is higher than the vibration amplification ring at the outer ring. The intelligent online self-cleaning scale-free operating energy-saving device of the heat exchanging equipment can rapidly remove scales on a heat transfer surface, continuously remove scales on line, keep the heat exchanging equipment run in a scale-free state, improves the heat exchanging efficiency and achieves the aims of saving energy. After running, the device is not needed to be operated by an operator and can automatically and intelligently remove scales. With the functions of removing and preventing scales, the invention also has the advantagesof playing roles of anticorrosion, sterilization and algae killing, preventing the heat exchanging equipment from being corroded, and lowering the check and maintenance expenses of the equipment.