Foldable headrest and automobile seat

The utility model provides a foldable headrest which is installed on a backrest and comprises a headrest body, a pair of supporting rods, a pair of supporting blocks and an upper clamping block. The supporting blocks are fixedly mounted in the middle of the back of the backrest, and through holes are formed in the middles of the supporting blocks; the pair of supporting rods are L-shaped, one ends of the pair of supporting rods are fixedly connected with the headrest, and the other ends of the pair of supporting rods are respectively inserted into the pair of through holes; the upper clamping block is fixedly connected to the upper portion of the back face of the backrest, and when the supporting rod rotates upwards around the through hole, the supporting rod is clamped into the upper clamping block. The supporting rod is clamped into the upper clamping block, and the upper clamping block and the bearing block fix the supporting rod and the headrest together. When the backrest needs to be rotated, the support