Fixed form lifting platform and self-leveling method thereof

The invention relates to a fixed lifting platform, consisting of a bearing platform, a lifting system, a control system and a self-leveling device; the self-leveling device comprises a first mirror reflective photoelectric switch which is electrically connected with the control system and a second mirror reflective photoelectric switch which is electrically connected with the control system and arranged side by side with the first mirror reflective at the same height; the self-leveling device also comprises a reflective part used for reflecting light generated by the first mirror reflective photoelectric switch back to the first mirror reflective photoelectric switch and a second reflective part used for reflecting the light generated by the second mirror reflective photoelectric switch back to the second mirror reflective photoelectric switch; the first reflective part and second reflective part are arranged side by side and partly overlapped along the up and down direction. When thebearing platform loads and unloads, the fixed lifting platform and an automatic self-leveling method can automatically keep the work surface of the bearing platform and the work surface of the other devices flush.