Based on the up to date development of the ultrasonic machining (USM) technology, applications and development trends of the ultrasonic machining tool are described. Automatic control including intelligent control and adaptive control, also tools in processing as an attachment and load matching system are trends in ultrasonic machining tool. The latest applications of ultrasonic machining technology in deep hole machining, ultrasonic elliptical vibration cutting, ultrasonic grinding, ultrasonic milling and ultrasonic combined machining are summarized, processing accuracy and processing efficiency have got a lot of progress. The development trends and future prospect of the ultrasonic machining technology are expounded. Studying the ultrasonic cutting mechanism, ultrasonic combined machining technology and micro-ultrasonic machining technology are the trends of ultrasonic machining.