Under the background of the gradual disappearance of “demographic dividend” and the in-depth implementation of the strategy of “talent power”, the skill supply structure of the floating population is changing rapidly. In this way, is the digital economy bound to widen the skill income gap? Based on the characteristics of Chinese labor skills supply-demand structure and digital economy development, this paper discusses the task based on endogenous technology progress framework proposed by Acemoglu and Restrepo (2019), to analyzes the mechanism of digital economy on the skill income gap of the floating population.After that, it conducts empirical tests by using the 2011-2018China Migrants Dynamic Survey and city level data. It is found that the development of digital economy has a widening effect on the high-low skills and middle-low skills income gap of the floating population. The development of the digital economy can significantly narrow the income gap between high-skilled and medium-and low-skilled migrants，when the structure of supply and demand in the labor market changes, especially when the supply of manual labor force declines. And, in large-population cities, the digital economy is more inclusive of low-skilled migrants.