Xiao Zhuang is the grandson of Xiao Yi, Emperor of Liang Yuan, and the son of Xiao Fang, King of Wu Lie. When his grandfather Emperor Liang Yuan was the king of eastern Hunan, Xiao Zhuang's father Xiao Fang was named Prince of eastern Hunan. After Emperor Yuan of Liang succeeded to the throne, he posthumously awarded his son Xiao Fang as King Wu Lie. Grandson Xiao Zhuang was named King Yongjia.
In the second year of Taiping (557), Chen Baxian abolished Emperor Liang Jingdi, and Wang Linying returned to Liang Si from Beiqi. Zhiying Prefecture is the emperor, with the title of "Apocalypse" and an official. The following year, he was defeated by Chen Chao and fled to Beiqi. He was awarded the title of Liang Wang by officials of Northern Qi Dynasty, including special entry and public affairs ceremony. And the death of Beiqi, he died of fear.
Xiao Zhuang continued to struggle with the Chen regime in the Southern Dynasties. In the third year of the Apocalypse (560), when Wang Lin, the general of Chen in the Southern Dynasty, was at war with the later Tang Dynasty in Wuhu, the Northern Zhou Dynasty sent troops to attack Yunzhou. As a result, Wang Lin was defeated and fled to Beiqi with Xiaozhuang.
In the first year of Wuping in the Northern Qi Dynasty (570), Gao Wei, the emperor of the Northern Qi Dynasty, appointed Xiao Zhuang as the Third Division of Special Jin and Kaifu Unification, made him the King of Liang, and promised to help him revive Nanliang. In the first year of Chengguang (577), the Northern Zhou Dynasty perished in the Northern Qi Dynasty, and Xiaozhuang died of resentment in Yecheng at the age of 29.