The relay protection equipment has many kinds and huge number of quantities. The traditional operation and maintenance mode of relay protection equipment that combines paper records and manual management has problems such as the heavy workload and errorproneness. Based on the application value of twodimensional code technology in the management of relay protection equipment, this paper uses twodimensional code with the characteristics of large capacity, small size, and high recognition rate, and applies it to the operation and maintenance of secondary equipment and the storage of asset information.By recording the information of each relay protection equipment in different stages of installation, operation, defect and return, the life cycle management of relay protection equipment is realized.Taking a specific secondary equipment as an example, the storage of equipment defects and asset information is realized through twodimensional code technology.The results show the twodimensional code technology can solve the problems of inconsistent accounts and low efficiency in manual management and is of great significance to improve the efficiency of onsite operation and maintenance of relay protection.