The barrier-free lifting platform is mainly composed of a track and a lifting platform. The track is inlaid on the wall of the entrance and exit of the passage, and extends downward with the slope of the stairs to the inside of the tunnel. The lifting platform can be folded against the wall when not in use, so as not to occupy the space at the entrance of the passage. When using the wheelchair, the four wheels of the wheelchair can be fixed on the platform, and after pressing the switch, the lifting platform can be controlled to enter the underground passage, which is safe and convenient