The invention belongs to the technical field of electrical power system dispatching automation, and particularly relates to a power grid equipment monitoring information confidence association analysis method based on an Apriori algorithm. The method comprises the following steps of (Step 1), finding a frequent item set of power grid history warning signals in a certain time according to the Apriori algorithm; (Step 2), finding out association rules among the signals through the frequent item set; and (Step 3), comparing the confidence coefficient value of the association rules, and screening the association rule with the confidence coefficient greater than the preset minimum confidence coefficient. The method has the advantages that help is provided for monitoring persons; and the safe and efficient operation of concentrated monitoring service is ensured, so that the monitoring operation work quality is comprehensively improved.