The invention relates to a disconnectable switch cabinet of a busbar connection portion. The switch cabinet comprises a switch cabinet body and a dolly switch. The switch cabinet also comprises a linkage mechanism and a stroke switch. A switch cabinet busbar is arranged in the switch cabinet body. One end of the switch cabinet busbar is connected to a grounding busbar through the stroke switch and the other end is connected to the dolly switch. The dolly switch is connected to the stroke switch through the linkage mechanism. When the dolly switch is pushed to an overhauling position, a linkage mechanism drives the stroke switch to disconnect the connection between the switch cabinet busbar and the grounding busbar. Compared to the prior art, by using the switch cabinet of the invention, the switch cabinet busbar and the grounding busbar are designed to be connected through the stroke switch; through the linkage mechanism, when the dolly switch is pushed to the overhauling position, the stroke switch automatically disconnects the connection between the switch cabinet busbar and the grounding busbar so that a personal safety accident generated because work personnel opens an isolation baffle plate without permission is avoided.