Ultrasonic cutting knife

The utility model discloses an ultrasonic cutting knife, which is characterized in that an ultrasonic transducer, an amplitude variation rod and cutting blades are arranged in a casing. A driving power supply is used for converting alternating current (AC) 220V 50Hz electric supply into high frequency high voltage alternating current and transmitting the current to the ultrasonic transducer, the ultrasonic transducer converts input energy into ultrasonic shockwave, one end of the amplitude variation rod is connected with the ultrasonic transducer, and the other end of the amplitude variation rod stretches out of the casing to be connected with the cutting knife. The ultrasonic cutting knife has the advantages of being compact in structure, convenient to carry, convenient to operate, high in cutting accuracy, good in incision face smooth finish, high in cutting speed, high in cutting efficiency, free of cutting pollution and the like, thereby being especially suitable for slit cutting of rubber output by a rubber refining machine, pipe cutting, cutting of frozen meat, sweet and chocolate, printed circuit boards, plastic product processing, food processing, natural fiber slit cutting in printing industry and automobile industry, heavy cutting of synthetic fiber, paint scrapping of thin artificial resin and cutting of paper and films in all the types and various glass fiber and carbon fiber cloth.