Hainanphasma is a genus of medium-sized, slender Phasmatodea species native to the Chinese island Hainan.

The capsule is dark brown, almost oval, punctulate and covered with small elevated brownish spots.

The micropylar plate is distinctly convex, laterally dilated and the posterior arms enclose the capsule but are not connected to each others.

[2] The range of the genus is the Chinese island of Hainan, where one species has been found in Jianfengling, Yinggeling, Wuzhishan, Huishan and Shangxi, the other one in Diaoluoshan.

Hainanphasma cristata was defined as type species, from which a total of 12 females, 11 males and 15 eggs were examined.