Insulation device and wet electrostatic precipitator having the same

An insulation device and a wet electrostatic precipitator having the same are provided. The insulation device comprises: an insulation device body 310 forming an insulating area 310-1, the insulation device body being connected to a wet electrostatic precipitator such that one open side of the insulating area is in communication with an interior of the wet electrostatic precipitator; an insulation device cover 320 connected to the insulation device body to close the other open side of the insulating area; and an insulator 330 passing through the insulation device cover such that one side of the insulator is disposed in the insulating area and the other side thereof is disposed outside the insulation device cover. One side of an electrode connecting member 400 is connected to a discharge electrode 200, whilst the other side passes through the insulator. The insulation device cover is configured to spray, onto the insulator, at least one of an insulator contamination prevention fluid, an insulator cleaning fluid, and an insulator drying fluid. The invention minimises contamination of a surface of the insulator that insulates a portion of the electrode connecting member connected to the discharge electrode and a power source.