Head fixing device convenient to adjust for ophthalmic surgery

The invention discloses a head fixing device convenient to adjust for ophthalmic surgery. The head fixing device comprises a rectangular plate; supporting rods are welded at four corners of the bottomend of the rectangular plate; an electric telescopic rod is arranged at the center of the bottom end of the rectangular plate; the output end of the electric telescopic rod penetrates through the outer wall of the rectangular plate; support rods are respectively welded at the left side and the right side of the top end of a permanent seat; rectangular seats are welded at the top ends of the support rods; through holes are formed in the upper surface and the lower surface of each rectangular seat; a fixed seat is welded in each rectangular seat; a pushing rod is inserted into each fixed seat;a pressing block is welded on the outer wall of each pushing rod; a spring is welded on the inner side of each pressing block; a circular ring is welded on the inner side of each pushing rod; a grooveis formed in each circular