Long stroke floating head support

The utility model discloses a long stroke floating head support which comprises a floating cushion block, a lifting rod and a base. A supporting plane is formed at the upper end of the floating cushion block, a concave spherical surface cushion tile is arranged at the lower end of the floating cushion block, a convex spherical surface head is arranged at the upper end of the lifting rod, the concave spherical surface cushion tile is positioned on the convex spherical surface head in a floating mode, and the lifting rod with the height capable of being adjusted is positioned on the base. Through the matching of the convex spherical surface head and the concave spherical surface cushion tile, automatic floating type all-area contact supporting between the floating cushion block and a workpiece is achieved in the supporting process, the workpiece is supported stably, supporting points are stressed in a balanced mode, the contact surface of the workpiece is not subject to damage caused by pressing, the workpiece