snRNA (small nuclear RNA) is a type of non-coding RNA with a length of 60 to 300 nt. Among the 15 known snRNAs, U1, U2, U4, U5, and U6 are the main components of eukaryotic RNA spliceosomes. The structure of snRNA is relatively conservative, with a cap structure and sm/Lsm structure at the 5' end, and a stem-loop structure at the 3' end. The main function of snRNA is to splice pre-mRNA and rRNA to produce corresponding mature mRNA and other non-coding RNA. In plants, snRNA can also participate in plant physiology and growth regulation. In recent years, it has been discovered that snRNA ends contain many modifications, including methylation, uridylation and adenylylation, etc. These modifications have an important impact on the processing and degradation of snRNA. Here, this paper briefly summarizes the current research results in the field of snRNA, including classification, gene structure, synthesis mechanism and biological function in plants. In addition, it also introduces the chemical modification of plant snRNA and its application in scientific research, and looks forward to the future research direction of snRNA.