Abstract: A non-bipyridyl salt herbicide, a preparation method therefor, and a use thereof are provided. A diene diamine compound having the structure of formula (I) or a tricyclic diene piperazine structure represented by formula (II) specifically provided. The non-bipyridyl salt compound can be converted into paraquat or diquat under light and air conditions, has equivalent herbicidal properties to paraquat or diquat, and the toxicity thereof is not significant. Therefore, the non-bipyridyl salt compound can be used as an herbicide as a non-toxic substitute for paraquat or diquat.