The invention provides an armour type metal closed switch cabinet with a transformer chamber. A meter chamber, a disconnector chamber, the transformer chamber and a main bus chamber are arranged inside a metal armour switch equipment cabinet body of the armour type metal closed switch cabinet with the transformer chamber, and the meter chamber, the disconnector chamber, the transformer chamber and the main bus chamber are separated through metal plates. A disconnector and a high-voltage fuse are installed inside the disconnector chamber. A transformer which is used is installed in the transformer chamber. A disconnector chamber decompressing plate is arranged on the disconnector chamber. A transformer chamber compressing plate is arranged on the transformer chamber. The main bus chamber decompressing plate is arranged on the main bus chamber. The disconnector is connected with a main bus of the main bus chamber through a first connecting copper bar. The disconnector is connected with the high-voltage fuse through a second connecting copper bar. The high-voltage fuse passes by a wall penetrating sleeve and a supporting insulator, and is connected with the transformer through a third connecting copper bar. The armour type metal closed switch cabinet with the transformer chamber has the advantages that corrosion prevention performance is good, safety performance and a high integration degree are achieved due to the fact that a high voltage and a control low voltage in the armour type metal closed switch cabinet with the transformer chamber are separated through the steel plates, a function of avoiding error interlocking is achieved, installation is simple and convenient, a safety margin is increased by more than 15%, and a bus needs less maintenance or is maintenance-free.