Diplopseustis prophetica is a moth in the Crambidae family. It was described by Meyrick in 1887. It is found in Australia, where it has been recorded from Victoria. The wingspan is about 14 mm. The forewings are pale brownish-ochreous, the base of the costa suffused with dark fuscous. The hindwings are pale whitish-ochreous, becoming pale brownish-ochreous towards the hindmargin.