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Sinomicrurus peinani is a new species of the genus Sinomicrurus (Serpentes: Elapidae) from China and Vietnam in 2020. In this study, we successfully sequenced mitochondrial genome of an individual S. peinani. The complete mitochondrial genome of S. peinani is a circular molecule with the entire length of 19,477 bp. The base composition is T (28.1%), G (11.9%), and GC (38.5%), which contains two ribosomal RNA (rRNA) genes, 22 transfer RNA (tRNA) genes, 13 protein-coding genes, one origin of replication gene (D-loop), and two non-coding control regions, an origin of light-strand replication, and a 2346 bp non-coding region between tRNA-N and tRNA-Y. A maximum-likelihood (ML) tree of S. peinani and 13 other related species was constructed. The DNA data presented here will be useful to study the evolutionary relationships and genetic diversity of S. peinani.