The utility model relates to an electrical tar precipitator, which comprises an electrical tar precipitator insulating box and a tar head. The tar head is connected with the electrical tar precipitator insulating box by a screw. The electrical tar precipitator is characterized in that the tail of the screw is welded on an upper cover of the electric tar precipitator insulating box. Compared with the prior art, the electrical tar precipitator effectively solves the problem of grounding accidents of an electrical tar precipitator due to failed sealing and tar leakage, repair frequency of the electrical tar precipitator is lowered, and catching effect of the electrical tar precipitator is improved.