Electrostatic dust collector for purifying flue gas and cathode device for electrostatic dust collector

The utility model discloses an electrostatic dust collector for purifying flue gas and a cathode device for the electrostatic dust collector. The cathode device for the electrostatic dust collector comprises a cathode framework and a corona electrode, wherein a steel wire rope serves as the corona electrode, and two ends of the steel wire rope are fixed on the cathode framework through steel wire rope clips, so that the steel wire rope is straightened and fixed. The electrostatic dust collector disclosed by the utility model comprises the cathode device disclosed by the utility model and an anode plate. The cathode device has the beneficial effects that the connection is stable, the service life is long, the discharge inception effect is good, installation programs are simple, the cost is saved, the working efficiency of the dust collector can be greatly improved, the investment is little, and the maintenance cost in later period is low; and the electrostatic dust collector can be widely applied to the new co