The digital economy has become the main battlefield for global companies. At present，there is no relatively reasonable assessment index for the competitiveness of global digital enterprises. Based on this，this paper constructs a competitiveness index which comprehensively evaluates the whole process from the three competitiveness of innovation，efficiency and scale. By existing relevant data，the top 100 global digital companies are listed. The results reveal that from the overall competitiveness rankings，Facebook，Google and Samsung ranked in the top three. From the perspective of the countries in which enterprises are distributed，the United States，Japan，and China are in the top three，and the United States is far ahead. In terms of industry distribution，the electrical and electronic equipment，semiconductor and telecom operators are the top three. After that，the analysis was carried out from the above “three competitiveness”.