Calamaria yunnanensis is a species of snake of the family Colubridae.

It has a cylindrical body and a small, pointed head.The snake's coloration is generally brown or grayish-brown dorsally, with a lighter, sometimes yellowish, ventral surface.

[3] The Yunnan reed snake inhabits montane forest and shrubland habitats in the Wuliang Mountains.

It is believed to be a fossorial species, spending much of its time burrowing and moving through leaf litter and soil.

The snake's diet likely consists of small invertebrates, such as insects and earthworms, that it forages for underground.Little is known about the snake's reproductive biology and life cycle, as it is a poorly studied species.