The head of the purple sand snake is slightly triangular, the eyes are large, and the pupils are erect and oval; the neck is thin and distinct. There are symmetrical green-brown longitudinal stripes on the back and sides of the head, extending backward; black Y-shaped stripes are faintly visible on the top of the back of the head; the back of the body is purple-brown, the dorsal scales are smooth and dull, with 17 rows in the middle; the ventral surface is yellow-brown, the back is purple brown. Most of them are irregular ∧-shaped light brown spots inlaid with dark purple, and some have no such spots, but only irregularly arranged dark brown short fold lines.

The ventral surface of the purple sand snake is light yellow, densely covered with purple-brown fine spots, or with purple-brown vertical lines or spots Lines and lines; body measurement slightly dark and light vertical lines. The head and back are purple-brown, with several dark purple longitudinal stripes with light brown edges; the lips and mandible are light brown.