An uninterruptible power adapter of an energy-storage emergency power supply belongs to the technical field of power engineering. The uninterruptible power adapter comprises two normally-open electromagnetic switches, a normally-closed electromagnetic switch, a group of reactors and two knife switches, wherein the two normally-open electromagnetic switches comprise current coils 1 and normally-open contacts 2, the normally-open electromagnetic switch comprises the current coils 1 and normally-closed contacts 3, the knife switch 4 is connected with a social power grid 10, the knife switch 5 provided with a front reactor 12 is connected with a unit power grid 11, the normally-closed electromagnetic switch is connected between a power supply terminal 7 of the emergency power supply 9 and the knife switch 5 connecting the unit power grid 11, one of the two normally-open electromagnetic switches is connected between the social power grid 10 and a charging terminal 6 of the emergency power supply 9, and the other normally-open electromagnetic switch is connected between the knife switch 4 and the knife switch 5. When the social power grid 10 supplies power, the adaptor 8 enables to supply power to the unit power grid 11 and charges the emergency power supply 9; and when the social power grid 10 is cut off, power is immediately and automatically supplied to the unit power grid 11. The uninterruptible power adapter is used for the energy-storage emergency power supply.