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This utility model belongs to the field of hole-opening tool technology, specifically relating to a hole opener, including a connecting rod and a central drill bit; characterized in that at least two centering rings are provided on the connecting part of the central drill bit, and the connecting rod is provided with a shaft hole to accommodate the connecting part of the central drill bit; the centering rings are inserted into the shaft hole with an interference fit, realizing the connection between the central drill bit and the connecting rod. This hole opener does not require the use of screws to tighten the central drill bit during installation, making installation and disassembly extremely convenient, and ensuring coaxiality to avoid damage to the central drill bit caused by wobbling.