Novel cathode wire tensioning device applied to electrical tar precipitator

The utility model discloses a novel cathode wire tensioning device applied to an electrical tar precipitator, which comprises an upper cathode frame, a first connecting hole is arranged in the middle of the top of the upper cathode frame in a penetrating manner, a cathode wire is arranged in the middle of the first connecting hole in a penetrating manner, a lower cathode frame is arranged at the bottom of the upper cathode frame, and a second connecting hole is arranged in the lower cathode frame in a penetrating manner. And a fixing nut is fixedly connected to the middle of the bottom of the lower cathode frame. According to the utility model, when the cathode wire is loosened due to flue gas temperature change after the electrical tar precipitator operates with load for a long time, the rotating block is rotated by a worker to drive the rotating rod to rotate, the fixed gasket is driven to move downwards, and the fixed gasket moves downwards to drive the cathode wire to move downwards; the fixing gasket mov