Tridrepana unispina is a moth in the Drepanidae family. It is found in China (Fujian, Guangdong, Chongqing, Sichuan, Yunnan), Japan and Taiwan. The wingspan is 27–42 mm. Adults are on wing in June. The larvae feed on the leaves of Castanopsis formosana. Mature larvae curl a leaf margin and fix it with silk at the leaf tip to pupate inside.