A knee joint soft tissue balance measurement device and a measurement method thereof. The measurement device comprises: a datum plate (10), a movable plate (20), a base body (30), an actuator (40), a gap indicator (50), an extorsion indicator (60) and a load indicator (70), wherein the datum plate (10) is fixedly connected to the base body (30); the movable plate (20) is rotatably connected to the actuator (40); the gap indicator (50) is connected with the actuator (40); the extorsion indicator (60) is connected with the movable plate (20); the load indicator (70) is connected with the actuator (40); and the actuator (40) is disposed on the base body (30). With the measurement device and the measurement method thereof, comprehensive measurements for a straightening gap, a knee-bending gap, a physiological extorsional angle of femur and the magnitude of an applied load can be carried out at the same time, and prior to the formation of the knee-bending gap, a prejudgment can be produced on the basis of the measured parameters and the original balance condition of soft tissues to determine the knee-bending gap consistent with physiological features, thus attaining the anticipated soft tissue balance.
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