The utility model discloses a wire clamping device for a large-section carbon fiber wire. The wire clamping device comprises a control mechanism and a clamping mechanism connected through a pin shaft,the control mechanism comprises a wire clamping device body (1), a pressing plate (2), a pull ring (5), a pull plate (6), a connecting rod (7) and a connecting pin shaft. The clamping mechanism comprises an upper clamping nozzle (3) and a lower clamping nozzle (4) of which the inner arc surfaces are provided with inclined anti-skid threads; and the body (1) is connected with the lower clamping nozzle (4) through a pin shaft. The wire clamping device provided by the utility model meets the requirement of a spreading load, the length of the clamping nozzle is short, the weight of the wire clamping device is reduced, the labor intensity is reduced, and the miniaturization and light weight of a machine tool are ensured; abrasion of the clamping nozzle to the wire is reduced, slippage is prevented, wire stripping accidents are reduced, and construction safety is improved.