The invention discloses a hydraulic tightening device and a method which can be controlled remotely, and relates to the technical field of power transmission and transformation. The remotely controllable hydraulic wire tightening device includes a wire tightener for tightening a cable, a hydraulic motor for controlling the action of the wire tightener, and a hydraulic drive system for driving thehydraulic motor to operate; Also included is a hydraulic remote control system for remotely wirelessly controlling a hydraulic drive system; The output end of the hydraulic drive system is connected with the input end of the hydraulic motor, and the power output end of the hydraulic motor is connected with the power input end of the wire tensioner. The power output end of the thread tensioner is used for thread tightening and hanging-up operation. The invention provides a hydraulic tightening device and a method which can be controlled remotely, realizing simultaneous tightening of high-altitude adjacent cables, increasing a single tightening distance, and realizing remote control operation on the ground or in the air.