Present main method of organic wastewater treatment are physico- chemical method, biochemical method and combination method, but there are many problems need to be resolved, such as organic matter can not be treated thoroughly, fee is high, and operation is complicated. Cavitation jets is a efficient and simple new technology on organic wastewater treatment. It use local high temperature and high pressure produced bubbles collapse to degrade organic matter, and it is better in capacity usage ratio than ultrasonic cavitation. Principle of eavitating jets is giuen, then discussed mechanism of organic wastewater treatment by cavitating jets from free radical reaction, direct thermal decomposition and supereritieal water oxidation, and influence of nozzle stricture is analyzed, jet cavitation number, pumping pressure, confining pressure and physieoehemieal property of organic wastewater on cavitation effect.