This study diagnoses the opportunities and risk factors related to the pursuit of defense digital transformation, and proposes a strategy for building an infrastructure of blockchain technology and implication as a base technology for building a digitalized defense force. The scope of the study was to analyze the usage status of blockchain and technology development trends in the defense field of global countries. Diagnosed the reason why blockchain technology does not get power in Korea defense field. Based on this, the defense utilization strategy was proposed, such as the utilization of blockchain in the field of operation, support, and security in the defense and the establishment of infrastructure. The research result is expected to be an option for defense digital transformation and technological hegemony response of global countries.