The utility model relates to a continuous power supply ammeter replacement device, one end of a push button is located outside a housing, the other end is connected with a conduction member, one end of a plugging column is connected with the conduction member, the other end is a plugging end, and the plugging column is sleeved with a reset spring; one end of the lock spring is connected with the shell, and the other end of the lock spring is located on the pushing track of the conduction piece. Wherein the rotary latch hook is rotatably installed inside the shell, one end of the rotary latch hook is hook-shaped, the other end of the rotary latch hook is connected with the latch hook push-pull piece, one end of the push-hook key is located outside the shell, the other end of the push-hook key is connected with the latch hook push-pull piece, and a latch hook reset spring is arranged between one end of the latch hook push-pull piece and the inner wall of the shell; one end of the push-pull piece lock spring is arranged in the shell, and the other end is inserted from the opening; and a lock hook unlocking key is arranged on the shell. According to the utility model, the electric meter can be replaced without power failure, so that the power consumption of enterprises and public institutions and residents is not influenced.