A self-adjusting supporting head comprises a vehicle body lifting column (10) and a load-bearing detection device arranged on the vehicle body lifting column (10). The load-bearing detection device comprises a spring supporting plate (5), a spring (6), a limiting switch tip (8), a load limiting switch (9) and a floating load-bearing adjusting device. The floating load-bearing adjusting device comprises a floating load-bearing block (1), a floating load-bearing block mounting base (2) and a floating connector. The floating load-bearing block is in spherical fit with the floating load-bearing block mounting base.