The invention provides a conductive grease brushing device for leads. The conductive grease brushing device comprises a conductive grease storage barrel, a push device and a brushing head, wherein the conductive grease storage barrel comprises a barrel body, a sealing mold and a movable end cover; the push device comprises a fixed rack, a support frame and a telescopic mechanism, wherein the fixed rack is arranged on the barrel body, the support frame is arranged on the fixed rack, one end of the telescopic mechanism is arranged on the support frame, and the other end of the telescopic mechanism is arranged outside the movable end cover; the brushing head comprises a connecting cover and bristle, the open end of the connecting cover is arranged at the end, where the sealing mold is arranged, of the barrel body, a groove is formed in the sealed end of the connecting cover, holes are distributed in the inner wall of the groove, and the bristle is arranged on the inner wall of the groove. The telescopic mechanism in the push device pushes the movable end cover to move in the barrel body, so as to push the conductive grease into the connecting cover; the conductive grease enters the bristle through the holes, and the groove is clamped onto a lead for brushing.