There is an arrow-shaped spot on the back of the head and back of the big-eyed oblique-scale snake, but its outer edge is not inlaid with fine white lines; the upper lip scales are 7-8, and a few have 6; the dorsal scales are ribbed, and the front of the body is arranged obliquely.

The head of the big-eyed oblique-scale snake is oval, and the head and neck are clearly distinguished The eyes are large and the snout is blunt, generally 500-1000mm in length, and the color spots on the back of the body vary greatly, with orange, light blue, brown-red, brown-black patterns. There are also a considerable number of melanized individuals, dark gray from the back of the head to the end of the tail, without other markings.

There are 40-60 reticulates on its back. The back of the head is black-brown, black-yellow or without spots, and the posterior edge of the upper lip scale is black. There is a black arrow-shaped spot on the back of the neck, and its outer edge is not inlaid with thin white lines, but very few are inlaid with thicker white lines.