The invention discloses a composite drill bit, and belongs to the technical field of drilling equipment in petroleum and gas, mine engineering, building foundation engineering construction, geology, hydrology and the like. The mixed drill bit comprises a drill bit body, at least one cone and at least one cutter disk. The cone and the cutter disk are respectively connected with the drill bit body through a bearing structure in a rotating mode. A range of a deflection angle of the disk cutter is from 20 degrees to 90 degrees or from -90 degrees to -20 degrees. The cutter disk is provided with cutter disk cutting teeth. The cone is provided with cross-embedded teeth, and a value range of a deflection angle alpha of the tooth top of each cross-embedded tooth is 70 degrees <=|alpha|<= 90 degrees. A novel cone structure is adopted and is combined with the disk cutter structure with large deflection angle so as to form the composite drill bit. The composite drill bit is high in rock breaking efficiency, the cone is stable in working, the drill bit is good in working stability, and meanwhile service life of the drill bit teeth and the bearing is prolonged, and therefore the service life of the drill bit is prolonged.