Disclosed are a nematicide containing a lactone ring and a preparation method and a use thereof where the nematicide comprises hydrogen cyano fluorine chlorine bromine an alkyl containing 1 to 4 carbon atoms an alkoxy containing 1 to 4 carbon atoms alkoxyphenyl an alkoxy containing 1 to 4 carbon atoms and a hydrogen atom on the carbon atom substituted by one or more chlorine atoms an alkoxy containing 1 to 4 carbon atoms and a hydrogen atom on the carbon atom substituted by one or more fluorine atoms nitro or amino and R is selected from hydrogen fluorine and chlorine. The invention has a good control effect on eggs and the second stage juveniles of root knot nematodes and in particular can fully inhibit the hatching of cucumber tomato tobacco soybean and other root knot nematode eggs during use over a long period of time pests do not produce antibodies against the nematicide of the present invention and same has a good nematicidal effect also provided in the invention is a method for preparing the nematicide containing the lactone ring wherein the preparation method has few steps and the process is easy to operate and is suitable for large scale industrial production.
