The invention relates to the technical field of cloud platform resource monitoring and especially relates to a method for customizing monitoring rules of cloud platform resources. The method comprises the following steps of: 1, regularly collecting monitoring data; 2, setting custom rules; 3, regularly querying rule lists; 4, polling each rule, and querying statistic results of monitored data according to the rules; 5, according to comparison between a threshold of each rule and the statistic result thereof, determining whether an alarm condition is met; 6, triggering the alarm action of the rule; and 7, finishing. The custom rules are set according to service requirements of a user, and newest monitored items, filtering conditions, data statistic modes, starting time, ending time, time intervals of statistics, threshold comparison modes, alarm triggering action, whether to repeat the alarm triggering action, and whether to be efficient are combined in a customized manner. According to the invention monitoring rule customizing is realized, and the method can be applied to the field of cloud platform resource monitoring.