Agonopterix ventrangulata is a moth in the Depressariidae family. It was described by Lvovsky and S.X. Wang in 2011. It is found in China (Fujian). The wingspan is about 20 mm. The forewings are greyish white, tinged with yellowish brown. There is a large triangular black patch at the base and the costal margin is scattered with greyish black dots and short streaks. A large patch is situated beyond the costal three-fifths, consisting of three inconspicuous longitudinal short black stripes. The discal spot is black with a white dot at the inside and there is a black spot in the middle of the cell. The termen has five short greyish black strips. The hindwings are greyish brown.