The embodiment of the utility model provides a paying-off block of an ultrahigh voltage power transmission line, comprising two vertical columns vertically arranged at the two ends of a base; a pulley shaft is arranged between the two vertical columns and is provided with pulley pieces; the top ends of the two vertical columns are provided with hanging plates; one of the two vertical columns is provided with a door-opening device; the number of the pulley pieces is nine, wherein every three pulley pieces and a sleeve are matched tightly into a whole body; the sleeve is sheathed on the pulley shaft and is in transition fit with the pulley shaft; and the nine pulley pieces comprise eight lead pulley pieces and a traction rope pulley piece which is positioned in the middle of the eight lead pulley pieces. The paying-off block of the ultrahigh voltage power transmission line can realize one-traction (4+4) tension paying-off construction technology of cophasal eight-bundled lead technique.