The invention discloses a substation secondary equipment running status grade judgment method and device. The method includes the steps: acquiring at least one running parameter of target equipment; calculating index values of the target equipment according to the running parameters by a fuzzy comprehensive evaluation method; judging the running status grade of the target equipment according to the index values. The target equipment is substation secondary equipment with the running status grade to be judged. The method and the device solve the technical problem that the running status of the secondary equipment in a substation cannot be accurately judged in related technology.