The invention discloses an elastic clamping jaw device which comprises an overturning mechanism and an aeroelasticity clamping jaw mechanism. The overturning mechanism comprises a spindle and a first rotating mechanism, wherein the first rotating mechanism can enable the spindle arranged in a base seat of an overturning cylinder to rotate, the aeroelasticity clamping jaw mechanism is fixed to the spindle and comprises upper clamps and a lower clamp, the plurality of upper clamps are arranged on the lower clamp in the rotating mode, guide blocks are connected with grooves inside the upper clamps in the sliding mode, guiding shafts are fixed on the guiding blocks and penetrate the upper clamps, springs are arranged outside the guiding shafts in the sleeve mode, two ends of each spring are supported by the end surface of the corresponding guiding block and the end surface of the groove inside the corresponding upper clamp, a first travel mechanism is fixed on the rear side of the lower clamp and used for pushing the guide blocks to slide along the interiors of the upper clamps to press the springs on the upper clamps, therefore, the upper clamps are pressed on the lower clamp or are away from the lower clamp. The elastic clamping jaw device has the advantages of conveniently adjusting the clamping jaw and evening the clamp force.