The invention discloses an intelligent substation equipment soft pressing plate checking method based on a KMP algorithm comprises the following steps of step1, establishing an equipment overhauling rule base; step2, collecting current in-service and out-of-service state information and in-service and out-of-service change information of a soft pressing plate of equipment in an intelligent substation in real time, and storing to a buffer in real time; step3, using the KMP algorithm to take an acquired equipment-soft-pressing-plate in-service and out-of-service sequence as a characteristic quantity, carrying out fuzzy matching with the equipment overhauling rule base and calculating a matching degree index; step4, if the matching degree index is greater than or equal to a configured matching degree index, determining that current equipment is in an overhauling state and entering into a step5; step5, according to a matched equipment overhauling rule, carrying out double checking of the in-service and out-of-service sequence and an in-service and out-of-service state on an equipment-soft-pressing-plate in-service and out-of-service state in the buffer, and when the in-service and out-of-service sequences are not consistent or the in-service and out-of-service states are not consistent, emitting a soft-pressing-plate in-service and out-of-service abnormal notification. A workload is simplified, and normalization of a checking process and correctness of a checking result can be effectively guaranteed.