The utility model discloses a railway electrification gas insulated switch cabinet, which comprises a cabinet body, an instrument chamber, a mechanism chamber, a cable chamber, a lower air chamber, an upper air chamber and a bus chamber. The instrument chamber, the mechanism chamber, the cable chamber, the lower air chamber, the upper air chamber and the bus chamber are disposed in the cabinet body and mutually separated, a separation operating mechanism and a circuit breaker operating mechanism are arranged in the mechanism chamber, a plug-in voltage transformer, a plug-in ZnO lightning arrestor, a plug-in cable and a cable feed-through current transformer are arranged in the cable chamber, a circuit breaker is disposed in the lower air chamber, a three-position switch is disposed in the upper air chamber, the lower air chamber and the upper air chamber are filled with SF6 gas, a bus is disposed in the bus chamber, the separation operating mechanism is connected with the three-position switch, and the circuit breaker operating mechanism is connected with the circuit breaker. The switch cabinet has the advantages of compact structure, reasonable element arrangement, attractive appearance, fine sealing property, reliable interlocking, long service life, high opening and closing capacity, reliable and safe operation, convenient field installation and the like.