Disclosed is a hard rock coring bit assembly, comprising a cone hob (10) and a saddle (20). The cone hob (10) comprises a base part (11) used for operation and a connecting part (12) which is integrated with the base part in one piece and is detachably connected in the saddle. One side of the connecting part (12) is provided with a butt joint oblique plane (13), and the width of the connecting part is gradually increased from the end close to the base part to the end far away from the base part. A fixing block (50) is also detachably connected in the saddle. A pressure-bearing oblique plane (51) attached to the butt joint oblique plane in a matching and abutting mode is formed by means of one side surface of the fixing block, and the width of the fixing block is gradually reduced from the end close to the base part to the end far away from the base part. The saddle is sleeved outside the connecting part and the fixing block. Compared with the existing welding manner, this hard rock coring bit assembly can realize quick disassembly and installation of the cone hob and the saddle, is capable of being standardized, is good in exchangeability, and is capable of improving the drilling operation efficiency. Meanwhile, the hard rock coring bit assembly is high in connecting strength, and is capable of meeting the requirements of drilling operations.
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