Detachable type gang way capable of realizing large-range displacement compensation

The invention discloses a detachable type gang way capable of realizing large-range displacement compensation. The detachable type gang way comprises a bridge body, an upper rotary disc mechanism anda lower rotary disc mechanism, wherein the two ends of the bridge body are movably connected with the upper end of the upper rotary disc mechanism and the upper end of the lower rotary disc mechanismseparately; the lower end of the upper rotary disc mechanism is fixedly connected with a test model in the water tank; the lower end of the lower rotary disc mechanism is equipped with a shore-side base in a matched mode; the centre line of the bridge body and the tank side line define an included angle smaller than 10 degrees; one end of the bridge body can realize a rotation function of three axles through the upper rotary disc mechanism and the lower rotary disc mechanism; the lower rotary disc mechanism is provided with a linear moving function along a building platform; when the test model moves or swings, the upp