The invention discloses an insulator with a breakdown display device, and the insulator comprises an insulator body and an induction body. An induction coil is disposed on an iron core in a winding manner, and the iron core and the induction coil are disposed in an inner cavity of the insulator body, and are disposed at the upper end of a steel leg. The induction coil is connected with a signal processing circuit, and the signal processing circuit enables an electric field signal received in the induction coil to be amplified and then transmitted to a signal display circuit. The signal display circuit enables the electric field signal transmitted by the signal processing circuit to be displayed. The signal processing circuit and the signal display circuit are disposed on an insulating part. The insulator is simple in structure, is sensitive in reaction, can serve a means for the online operation detection of electrical equipment, brings convenience to a maintainer for safely and quickly finding and eliminating a fault, and achieves a purpose of protecting the electrical equipment.