Eudonia microdontalis is a moth in the Crambidae family. It was described by Hampson in 1907. It is found in Japan, China (Gansu, Hubei, Hunan, Zhejiang) and Russia. The wingspan is 16–22 mm. The forewings are white tinged with brown and irrorated with black. The antemedial line is double and filled with white. The hindwings are white, tinged with brown.