The mini horn can grow up, its maximum body length can reach 30 cm. Its fish body is oblong and laterally flat, with only a shield-shaped bony plate on the caudal peduncle and a keel.

The dorsal and anal fin spines of the mini horn are sharp, with V Spines and II spines, none of the fin rays are elongated. The caudal fin is truncated or concave, and the upper and lower leaf margins are not elongated as silk. The dorsal side of the body is brown, the ventral side is white, without any markings on the side of the body. The upper and lower leaves of the caudal fin are yellow, with white patches at the base, and the base of the bony plate is black.