The utility model relates to the technical field of mechanical oil extraction, in particular to a follow-up hydraulic polish rod sealing device. The polish rod sealing device solves the problems thatthe service life is short, the overall sealing performance is poor and the deviation adjusting and aligning functions are lacked due to the fact that packing of the polish rod sealing device is compressed too tightly. The utility model comprises a connector (1), a ball sealing ring (2), a large nut (3), a ball (4), a packing base (5), an O-shaped sealing ring (6), a nut (7), an outer wall cylinder(8), a packing gland (9), a handle (10), a dustproof ring (11), a metal pressing cap (12), a lubricating ring (13), a nylon pressing cap (14); the polish rod sealing device has the advantages of being scientific and reasonable in design, convenient to install, capable of prolonging the service life to the maximum extent and reducing the failure rate of a wellhead device to achieve cost reductionand benefit increase and the like.