A management method of instant communication service includes the steps of at least collecting user account numbers, user passwords, instant communication service names, client side versions, client side terminal type and login state information from registration information sent by instant communication service client sides, and generating hash values from the collected information through a hash function, recombining the hash values to form service identification of instant communication service, and managing the instant communication service according to the service identification. The compatibility and expandability of network service are improved, and instant communication service is uniformly managed.