Double-acting compression type packer

The utility model relates to an underground packer with the double-compression function. A center pipe of the packer is sleeved with an outer pipe, an outer step at the upper end of the center pipe corresponds to an inner step at the upper end of the outer pipe, a rubber sleeve sealing mechanism is arranged at the upper end of the outer pipe in a sleeved mode, an anchor mechanism is arranged in the middle of the outer pipe in a sleeved mode and located below the rubber sleeve sealing mechanism, a hydraulic mechanism is arranged at the lower end of the outer pipe in a sleeved mode and connected with the anchor mechanism, a square hole is distributed in the circumferential direction of the lower portion of the outer pipe, a locking block is installed in the square hole, the locking block protrudes out in the radial direction and is embedded into an inner groove of the hydraulic mechanism, a circumferential groove is formed in the periphery of the center pipe and located below the locking block, and the center p