Xiazhuangocaris is an extinct genus of bivalved arthropod known from the Cambrian aged Chengjiang Biota of Yunnan, China.

Only a single specimen (NIGP 172765) is known, around 5.3 centimetres (2.1 in) long, which only preserves the anatomy of the carapace and the trunk.

The bivalved carpace has a pronounced pair of notches at its front, as well as a posterior notch at its rear.

The body had at least 13 tergite-pleurite rings, which terminate in a pair of rounded caudal rami, which are fringed with setae.

The describing authors interpreted the taxon as a member of Hymenocarina, which contains other Cambrian bivalved arthropods.