The discovery of Striogyia simianshanasp. nov. (Lepidoptera: Limacodidae) resulted from a research project investigating the biodiversity of the Simian Mountain Nature Reserve in Chongqing, Southwest China. This new species is characterised by several distinct features, namely the black, broken postmedial line of the forewing and the long filiform antenna found in males. The shape of its valva, transtilla, juxta and phallus also distinguish it from other congeners. Furthermore, images of the adult habitus and male genitalia are compared with similar species S. obatera Wu, 2011 and S. acuta Wu, 2020, which further illustrate characteristics unique to S. simianshana. A distribution map and key for Chinese Striogyia species are provided.