The invention belongs to the technical field of well drilling corollary equipment and particularly relates to an oppositely-opened type hydraulic power slip. The oppositely-opened type hydraulic power slip comprises a plurality of sets of slip assemblies, and clamping cavities can be formed between the slip assemblies. The slip assemblies comprise outer shells, radial hydraulic cylinders arranged on the outer sides of the outer shells in the radial direction and slip seats arranged in the outer shells and fixedly connected with cylinder rods of the radial hydraulic cylinders. Slip bodies and axial hydraulic cylinders located on the outer sides of the slip bodies are arranged in the slip seats, and lifting frames connected with cylinder rods of the axial hydraulic cylinders are arranged on the slip bodies. The matching faces of the slip seats and the slip bodies are inclined faces. The clamping faces of the slip bodies form a clamping cavity used for clamping a drill pipe. According to the oppositely-opened type hydraulic power slip, the slip bodies can slide on the inclined faces of the slip seats, it is ensured that when the slip bodies clamp the drill pipe, the slip bodies can slide along with the drill pipe by a certain distance so that the self-locking capability of the slip can be achieved, the slip seats drive the slip bodies to slide in the outer shells under the pushing of the radial hydraulic cylinders, and the large diameter of an opened through hole is achieved.