The invention discloses a visualized phase-array fire alarm system which comprises a detection terminal and a monitoring terminal, wherein the detection terminal comprises a thermal radiation array sensor, a visible light camera, an external alarm data interface module and a signal composite processing transmission module, the monitoring terminal is composed of a data storage processor and a display or a computer with a display screen, and the detection terminal is connected to the monitoring terminal through a signal wire. The invention provides a visualized phase-array fire alarm system which is based on a complicated environment, regionally detects and displays temperature changes, regionally sets up alarm parameters, is compatible with various fire detection signal data and low in cost, and has a self-learning function; and according to the invention, the early property, visualization, intelligentization and systematization of fire alarming are realized, and the false alarm rate and cost of the system can be greatly reduced, thereby reducing the fire loss.