The invention discloses a lifting rope tensioning device and an implementation method thereof. The method comprises the following steps of: starting a jack of the tensioning device to move down, wherein during the downward moving process, a pressure-bearing base is static, and an anchor head, a fining twisted steel bar, a work anchor and a sleeper beam move down along with the jack; lifting up the work anchor and the sleeper beam in time according to the space in the pressure-bearing base, and simultaneously screwing down a second screw cap; and repeating the steps until a lifting rope is tensioned to a proper place. The lifting rope tensioning device provided by the invention is simple to manufacture and convenient to install and operate, and is capable of realizing rapid and convenient tensioning of the lifting rope, shortening the installation and tensioning time and reducing the cost and construction risks.