The invention discloses a distribution network microcomputer protection system integrating distribution automation master station dynamic setting. The system mainly comprises a protection event processing module, a protection event fault search module, a protection event alarm module, a protection constant value calling module and a protection constant value correcting and downloading module. The protection event processing module is used for receiving and recording a protection event actively sent by a distribution terminal. The protection event fault search module is used for searching for historical information of the distribution terminal. The protection event alarm module is used for carrying out display alarm on the protection event sent by the distribution terminal. The protection constant value calling module is used for checking protection constant values. The protection constant value correcting and downloading module is used for correcting and downloading the protection constant values. A master station and the terminal are in microcomputer protection communication, running conditions of a protection device can be monitored from the master station, the fault positions are analyzed rapidly when a fault occurs, and a response is given rapidly.