Promecotheca palmella is a species of beetle of the family Chrysomelidae. It is found on the Solomon Islands (New Georgia).
Adults reach a length of about 4.4 mm. They are bright red to shiny black. The head is pitchy black, while the prothorax is shiny black with a red base. The scutellum and elytra are red.
The recorded host plant for this species is an unidentified small pinnate palm (Arecaceae).