The utility model provides an electric cabinet eyebrow signboard fixing device. The electric cabinet eyebrow signboard fixing device comprises a fixing plate, an adjusting plate, a hanging plate, a main signboard and an auxiliary signboard. The hanging plate is L-shaped and comprises a vertical plate and a transverse plate; the vertical plate is buckled on the adjusting plate through the hanging groove, and the edge of the transverse plate abuts against the electrical cabinet body. The vertical plate comprises a main equipment identification area and an auxiliary identification area, the mainequipment identification area is of a rectangular frame type structure with an upward opening, grooves are formed in the left frame and the right frame of the main equipment identification area, firstinserting grooves allowing the main signboard to be inserted therein are defined inwards by the grooves, and the lower edges of the first inserting grooves abut against the auxiliary identification area; the auxiliary identification area comprises a rectangular frame type structure with a rightward opening and a protection frame plate, guide transverse grooves are formed in the upper border and the lower border of the frame type structure, and the two guide transverse grooves inwards define a second inserting groove for the auxiliary signboard to be inserted. The detachable electric cabinet eyebrow signboard is of a detachable structure, and when electric cabinet eyebrow information needs to be replaced, only the old signboard needs to be taken out of the slot to be replaced; not only aremounting and dismounting convenient, but also requirement for changing the function identification and attractive appearance can be ensured.