Diamond and monocone composite drill bit for hard formation well drilling

The invention relates to the technical field of drilling tools, in particular to a diamond and monocone composite drill bit for hard formation drilling. The diamond and monocone composite drill bit for hard formation well drilling comprises a diamond drill bit body and a monocone drill bit body, the diamond drill bit body comprises a main body (1) and a plurality of diamond teeth (2), the main body is provided with a hollow runner (3), the plurality of diamond teeth are installed at the bottom of the main body and can be driven by the main body (1) to rotate around the axis direction of the hollow runner (3) so as to crush an annular structure of an overall rock, and the monocone bit is installed on the hollow runner (3) and is arranged to be a rock stand column which can crush the overallrock and is located in the annular structure. The diamond and monocone composite drill bit for hard formation well drilling is formed by the monocone drill bit and the diamond drill bit together so that the monocone drill bi