Syllepte nigriflava is a moth in the Crambidae family. It was described by Swinhoe in 1894. It is found in India (Meghalaya, Sikkim). The wingspan is about 30 mm. Adults are orange, the forewings without a spot in the cell. The discocellular spot of both wings, the antemedial line of the forewings and the postmedial lines of both wings are black and the outer area and margin are unmarked.