The utility model discloses a device for multi-functional switching of transformer insulation test, plug in the button including the end screen wiring of high-pressure side sleeve pipe, the button is inserted in the end screen wiring of middling pressure side sleeve pipe, the height, and the screen wiring of well side end highly insulating and possess blocking function's high-voltage testing line, and the button is inserted to telescopic insulator spindle and ground connection, the end screen wiring of high-pressure side sleeve pipe is plugged in button and middling pressure side sleeve pipe end screen and is worked a telephone switchboard and plug in the button and set up front end and rear end on switching device respectively, button and height are inserted in the last screen wiring of middling pressure side sleeve pipe, and the last screen of well side is worked a telephone switchboard and is plugged in button and height with working a telephone switchboard through the last screen of middling pressure side sleeve pipe respectively, and wiring mouth and the built-in circuit connection of switching device are shielded to middling pressure side sleeve pipe end, this device for multi-functional switching of transformer insulation test, transformer bushing end screen and pressurization winding cause experimental transfer box, can realize the operation of only need once ascending a height of all insulating projects, reduced experimental wiring personnel fall from high altitude the risk and intensity of labour, improved test efficiency to the assurance test work safety, the high-efficient completion.