The invention discloses a protection device constant value automatic management method based on fuzzy matching, and relates to the field of power system scheduling automation. According to a conventional transformer substation, the constant value cannot be modified remotely, a worker is needed to perform constant value modification in the field, and disadvantages of low efficiency, high maintenance cost, long maintenance time and easy mistake occurrence exist. The method of the invention is characterized in that a master station is provided with a protection main unit located in a power system safe I region, a remote operation command is issued by the master station to the protection main unit, and the protection main unit is in communication with station protection devices through the IEC61850 specification; and protection device constant value automatic management is performed. According to the technical scheme, the protection main unit is added, the constant value modification control function can be realized, the advantage of reliable operation can be realized, adjustment and control integration of the production operation department can be facilitated, the accident processing scheme can be made fast, the production scheduling and management decision making can be optimized, the protection device constant value can be modified timely, and the accident loss of the power grid can be reduced.