The invention provides a steel-clad movable-type metal-enclosed switchgear with a fault diagnosis device. The switchgear comprises an upper static contact, a fault diagnosis handcart, a lower static contact, a second connecting copper bar, a high voltage insulator, a second main bus-bar, a first main bus-bar and a first connecting copper bar, wherein the fault diagnosis handcart is directly connected with the first connecting copper bar and the second connecting copper bar through the upper static contact and the lower static contact, and the first connecting copper bar is connected with the first main bus-bar; the second connecting copper bar is electrically connected with the second main bus-bar through the support of the high voltage insulator. The switchgear has the beneficial effects of avoiding expansion of accident scope and undue failure occurrence, prolonging the maintenance period and service life of equipment, and effectively improving the operating environment of power supply equipment and high voltage electrical apparatus. When the electrical fault of a switchgear body occurs, the switchgear body or a body is maintained after the fault diagnosis handcart is directly pulled out of the switchgear, so that the situation that a person touches a live part when entering the switchgear body is prevented; meanwhile, the main bus-bars can be maintained without power outage.