Gastroserica jinxiuensis is a species of beetle of the family Scarabaeidae. It is found in China (Guangxi).
Adults reach a length of about 8.8 mm. They have an oval body. The pronotum is dark brown and the surface is dull, the dorsal surface with moderately dense, long, erect setae.
The species is named after the type locality, Jinxiu.