The male Hainan Amphora is 865mm in length, and the female is 610mm in length.

The back of the Hainan Snap-scale Snake is blue-brown, with metallic luster, on both sides There are 1 or 2 intermittent white longitudinal stripes between the bottom 3 rows of dorsal scales, the bottom row of dorsal scales is gray-white; the ventral surface is gray-white, and the lower tail scales at the rear of the tail are blue-brown. The back of the head is blue-brown, and the head and belly are light blue-gray or light brown. The head is small and slightly flat, the muzzle is round and pure, and the trunk is cylindrical.