Tridrepana rubromarginata is a moth in the family Drepanidae. It was described by John Henry Leech in 1898. It is found in China, India, Bhutan and Nepal.Song, Wenhui; Xue, Dayong & Han, Hongxiang (2011). "A taxonomic revision of Tridrepana Swinhoe, 1895 in China, with descriptions of three new species (Lepidoptera, Drepanidae)". Zootaxa. 3021: 39–62.
It features a wingspan of approximately 33 mm. The forewings are predominantly yellow, with a reddish-brown border extending from vein 6 to the inner margin. The antemedial line is blackish and undulates, while the postmedial line is blackish, wavy, and intermittently interrupted towards the costa. A submarginal line, which is blackish and wavy, becomes indistinct as it approaches both the costa and the inner margin. Additionally, there is a black spot on the inner margin marking the termination point of these lines. The discal cell contains two blackish spots, an eight-shaped mark at the cell's end, and a more or less round mark below it, with the upper part of the eight-shaped mark centered in whitish color. The reddish marginal border is intersected by a wavy line of the ground color. The hindwings are paler, with faint transverse markings primarily visible in the abdominal area. Notably, there is a blackish spot between veins 2 and 3, and another between veins 3 and 4, with the former centered in white.
Subspecies Tridrepana rubromarginata rubromarginata (China: Gansu, Fujian, Sichuan, Yunnan) Tridrepana rubromarginata indica Watson, 1957 (India, Bhutan, Nepal, China: Tibet)
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