The invention discloses a power transmission line erecting device for electric power engineering, which comprises a mounting base, a support rod, a pressing mechanism and several hooks, the several hooks are respectively connected to the mounting base through extension rods, the extension rod is a hollow structure, and the pressing mechanism It includes a thread support plate, a guide rod and a first spring arranged in the hook, the thread support plate is connected with the extension rod through the first spring, the guide rod is arranged inside the first spring, one end of which is fixedly connected with the thread support plate, and the other end is connected with the extension rod. The extension rod is slidingly connected; there is a pull ring under the mounting seat, the pull ring is connected to the guide rod through the first pull wire, a vertical support rod is provided under the mounting seat, a clip is provided on the top of the support rod, and a second spring is provided on the clip. The clip is connected to the pull handle through the second pull wire. The hook is hooked on the erected transmission line, and the transmission line is pressed by the compression mechanism. The support rod supports the mounting seat to reduce the sag of the transmission line. construction efficiency.