The invention relates to the field of inhaul cable pre-stressed structure construction devices, in particular to an inhaul cable tensioning device. In the prior art, the inhaul cable tensioning construction adopts manual construction through a wrench, the labor intensity is high, the construction is dangerous and cannot be constructed in extreme environment. The invention provides the inhaul cabletensioning device. The inhaul cable tensioning device comprises a node plate, a fork ear anchorage device, a connecting nut and a connecting anchorage device which are connected in sequence. The nodeplate is used for connecting with a connecting inhaul cable or a building, the fork ear anchorage device is connected with the node plate through a pin shaft, and the connecting anchorage device is internally connected with an inhaul cable; and the inhaul cable tensioning device further comprises a power device, the input end of the power device is used for connecting with a remote control deviceto realize the purpose of remotely controlling the rotation of the connecting nut, and the output end of the power device is connected with the connecting nut and used for driving the connecting nutto rotate. Compared with the prior art, the inhaul cable tensioning device has the advantages of low labor intensity, suitability for extreme environments, and safe use.