The invention discloses a metal-armored switch device with an uninterruptible maintenance function. The device comprises two groups of buses for mutual backup, two groups of bus isolation switches, acircuit breaker, a circuit breaker handcart used for installing the circuit breaker, a circuit breaker isolation switch, a current transformer, a current transformer handcart used for installing the current transformer, and a current transformer isolation switch. Any group of bus is selected to supply power by switching the two groups of bus isolation switches, so that power supply guarantee is realized. Uninterruptible maintenance or replacement of the circuit breaker is realized through the circuit breaker isolation switches, and the uninterruptible maintenance or replacement of the currenttransformer is realized through the current transformer handcart and the current transformer isolation switch.