Grading gauge protection hob mechanism and cutterhead

The utility model belongs to the technical field of shield construction, and discloses a grading gauge protection hob mechanism and a cutterhead, the grading gauge protection hob mechanism is arranged on a cutterhead body, and a through mounting groove is formed in the cutterhead body; the grading gauge protection hob mechanism comprises a hob assembly and a grading adjusting assembly, the hob assembly comprises a tool apron and a hob, the hob is rotationally arranged on the tool apron, the tool apron slides in the mounting groove, and part of the hob protrudes out of the mounting groove; the grading adjusting assembly is detachably arranged on the cutter head body, the output end of the grading adjusting assembly is connected with the cutter holder, and the grading adjusting assembly adjusts the protruding amount of the hob protruding out of the mounting groove. The cutter head comprises the grading gauge protection hob mechanism. And the protruding amount of the new hob is reduced through the grading adjust