The invention provides an IEC61850/MMS communication simulation method of a protection action event when a fault occurs in a power system. The IEC61850/MMS communication simulation method comprises the following steps: inquiring the protection event sequence and switching value of a protection device for simulating pre-configured in an SQL (structured query language) database; starting IEC61850/MMS communication service; using the BRCB (buffering report control block) characteristic of a band buffering report of an MMS (main machine system) to regularly write sequences for sending during a period of time in the protection event sequence and switching value at one time to an MMS data object, wherein MMS service generates a one-time switching value and a protection event report; and repeating the step (3) until all items of the protection event sequence and the switching value are processed. A virtual intelligent electronic device simulation system set up by a normal PC (personal computer) machine running windows system can be used for substituting a physical intelligent electronic device such as a relay protection device and a monitoring device, so that precise millisecond of protection action event sequence is generated, convenient and flexible debugging and verifying to the high-level application of an intelligent converting station automatic system based on the IEC61850 communication are achieved.