The complete mitochondrial genomes of two Prophantis Warren, 1896 species in the tribe Trichaeini (Lepidoptera: Crambidae) were sequenced using high-throughput sequencing technology. They were assembled and annotated: the complete mitogenomes of P. octoguttalis and P. adusta were 15,197 bp and 15,714 bp, respectively, and contain 13 protein-coding genes, 22 transfer RNA genes, two ribosomal RNA genes, and an A + T-rich region. Their arrangement was consistent with the first sequenced mitogenome of Lepidoptera, from Bombyx mori (Bombycidae). The nucleotide composition was obviously AT-biased, and all protein-coding genes, except for the cox1 gene (CGA), used ATN as the start codon. Except for trnS1, which lacked the DHU arm, all tRNA genes could fold into the clover-leaf structure. Phylogenetic trees of Pyraloidea were reconstructed based on mitogenomic data using Maximum likelihood (ML) and Bayesian inference (BI) analysis methods. The results showed that Trichaeini formed a monophyletic group with high branch support in Spilomelinae, sister to Nomophilini. In addition, the phylogenetic relationships among subfamilies of Pyraloidea were generally stable: (Galleriinae + ((Epipaschiinae + Pyralinae) + Phycitinae)) + ((Pyraustinae + Spilomelinae) + ((Odontiinae + Glaphyrinae) + CAMMSS clade)), although the affinities of some subfamilies in the “CAMMSS clade” were still unresolved.