The utility model relates to a high tension transmission line technical field especially relates to a conductor spacer mounting tool. This conductor spacer mounting tool including collude the seat, the type colludes, head briquetting, piston, hydraulic driving part and the control unit, the work of the control unit control hydraulic pump, the hydraulic pump drive piston is flexible, and the piston stretches out or the seat is colluded in the indentation to drive the head briquetting and reciprocate, during the rebound of head briquetting, the pressure -bearing portion cooperation of colluding rather than the type of top, fastener pressfitting that will be between the two, thus make the fastener press from both sides tightly on the power transmission line, accomplished the installation of conductor spacer promptly, whole operation process passes through hydraulic driving part and has realized hydraulic actuating, and the rapid operation has improved work efficiency, the commonality is good, can adapt to different grade type conductor spacer, and compact structure, convenient to carry, more importantly has realized one -hand operation, the single operation in high altitude of being convenient for, the security that has improved high altitude construction.