The invention provides a centralized audible and visual alarm power failure indicator, a mechanism and a method. An element region and an audible and visual indication region are arranged in a shell;the audible and visual indication region is provided with a buzzer, a power failure detection loop and an audible and visual alarm loop are arranged in a green light indication region and a red lightindication region in the element region; the power failure detection loop and the audible and visual alarm loop are respectively connected with the buzzer. Server faults can be reflected quickly, machine room operation and maintenance staffs can be notified quickly to perform overhaul and trouble removal, monitoring of regulation and control workers to entire network equipment operating conditionsis guaranteed fully, and quality of civil electricity is guaranteed to meet requirements. Meanwhile, the power failure indicator is not only suitable for server systems, such as the machine room anda master station, but also can be used for various transformer substations after being improved a little, has the characteristics of alarming quickly, being simple in structure and convenient to mount, and so on, can quickly reflect transformer substation feeder branch power loss faults, guarantee the operation and maintenance maintainers to repair the faults in time and improve reliability of power supply and consumption of users.