Inverted multifunctional lightning-proof insulator

The utility model discloses an inverted multifunctional insulator. The insulator comprises an insulating shed and an insulating cylinder; and a resistor, a resistance card and a compression spring arearranged in the insulating cylinder. The insulator is characterized in that a top hardware fitting is arranged at the lower end of the insulating cylinder and is connected with the insulating cylinder through screw threads; the top hardware fitting is connected with an earthing clamp through an elliptical flange; the earthing clamp is provided with the metal ring; a cable led out from a switch end opening is clamped between the top hardware fitting and the earthing clamp; an upward aciculiform dentiform row is formed on the top hardware fitting; and a downward aciculiform dentiform row is arranged on the earthing clamp. The utility model has the advantages of multiple functions as follows: firstly, the insulator has lightning-protection function, and can replace a lightning arrester; secondly, the insulator is pr