Tunnel boring machine capable of expanding excavation of hard rock

The utility model relates to a hard rock tunnel boring machine capable of expanding excavation, and belongs to the technical field of tunneling machines, the hard rock tunnel boring machine comprises an auxiliary cutterhead, a driving part and a sleeve, the sleeve coaxially slides on a main beam, the driving part is arranged on the main beam and used for driving the sleeve to slide, a connecting rod is rotationally arranged on the sleeve, the connecting rod is connected with the auxiliary cutterhead, and the auxiliary cutterhead is connected with the driving part. The auxiliary cutter head can be connected with the cutter head in a clamped mode, and a plurality of auxiliary hobbing cutters are arranged on the auxiliary cutter head in a rotating mode. When a tunnel with a large diameter needs to be excavated, a driving part is started and drives a sleeve to slide, so that the sleeve pushes a connecting rod to move, an auxiliary cutter head is clamped to a cutter head, when the cutter head rotates, the auxiliar