The invention provides a double-hook power wire tightening device and a using method thereof. The double-hook power wire tightening device comprises a primary sleeve, secondary sleeves and tertiary sleeves, wherein a two-way ratchet device is arranged on the primary sleeve; a wire winding device is arranged in the primary sleeve; the other ends of the wire winding device are fixedly connected withthe tertiary sleeves; fixed baffles are arranged in the secondary sleeves; springs are arranged between fixed plates of the tertiary sleeves and the fixed baffles of the secondary sleeves; the primary sleeve is in threaded connection with the secondary sleeves; the secondary sleeves are in sliding fit connection with the tertiary sleeves; a pre-tightening control device and a tightening operationrod are arranged on the outer side of the primary sleeve. Through the double-hook power wire tightening device, the shrinkage length of the sleeves can be lengthened; rapid pre-tightening and slow final tightening can be achieved; the operation rod is capable of conveniently controlling two processes and can be bidirectionally controlled; a connection device is arranged between the operation rodand the sleeve and is capable of preventing the operation rod from falling off during high-altitude operation; the double-hook power wire tightening device is safe and reliable, and is convenient to operate.