As a new growth point and driving force of today's world economy, digital economy plays an important role in promoting economic development, improving labor productivity and realizing sustainable economic development. This paper constructs "The Belt and Road" digital economy development index of the countries along the border, and uses principal component analysis to calculate the development status of the digital economy along the line, and uses ArcGIS 102 software to carry out spatial analysis. The results show that the development of digital economy along the line has obvious aggregation characteristics and cascade development pattern.