The present invention discloses a
knee joint resistance training device, comprising a
thigh fixing rod, a calf fixing rod, a pair of
thigh fixators, a pair of calf fixators, a tension spring, and a plurality of buffer mechanisms, wherein the other ends of the plurality of buffer mechanisms are all arranged on the annular
airbag of the air source, the buffer mechanism comprising a first buffer movement mechanism and a second buffer movement mechanism, the first buffer movement mechanism being arranged on the annular
airbag, wherein an adjustment mechanism is arranged in the receiving groove of the adjustment limit block, the adjustment mechanism comprising a sliding
assembly, a step rod, and a connecting rod mechanism, the sliding
assembly being arranged in the receiving groove, and the connecting rod mechanism being arranged on the step rod. Due to the tension spring and the plurality of buffer mechanisms provided in the device, a good buffering effect can be provided during exercise, and the annular
airbag realizes inflation and pressure maintenance, so that the
thigh fixator and the calf fixator are fixed to the user's thigh and calf, respectively, to achieve a buffering effect.