The invention discloses a remote alarm method and system for water pressure abnormity of a fire hydrant based on fire disaster linkage. The system comprises an intelligent water pressure gauge, a firedisaster detector, an alarm controller and a monitoring terminal. The intelligent water pressure gauge is arranged on the fire hydrant and used for monitoring the change condition of a water pressurevalue of the fire hydrant in real time and transmitting water pressure information and current time information to the alarm controller in real time; the fire disaster detector is connected with thealarm controller and used for monitoring the fire disaster; the alarm controller is connected with an information transmission device and uploads all firefighting sensing information to a firefightingmonitoring center through the information transmission device; the monitoring terminal is wirelessly connected with the firefighting monitoring center and receives fire hydrant water pressure abnormity linkage alarm information and fire hydrant water pressure statistical analysis information which are pushed by the firefighting monitoring center. The remote alarm method and system have the advantages that multi-aspect monitoring of a networking unit, the firefighting monitoring center, a firefighting department and a maintenance company on the state of the fire hydrant is achieved, the protection awareness of the networking unit is improved, the supervisory function of the firefighting department is improved, and the maintenance efficiency of the fire hydrant is improved.