The invention discloses an internal conical spoke-type shield machine head capable of easily changing a cutter. The shield drive head unit comprises an annular cutter disk, a center cutter, multiple knife rest arms, a flange plate, a knife rest arm exit, multiple supporting arms and a shield shell; the multiple knife rest arms and the multiple supporting arms are arranged into internal conical structures in a radial mode respectively and are coaxially arranged in the shield shell, and the multiple knife rest arms are fixedly connected with the multiple supporting arms or slide along the multiple supporting arms; multiple tools are arranged on the multiple knife rest arms respectively, the multiple knife rest arms are fixedly arranged on the flange plate, and the annular cutter disk is fixedly arranged at the front ends of the multiple supporting arms; the center cutter is arranged in the middle of the flange plate, the exits of the multiple knife rest arms are located in the middle of the flange plate, and the flange plate is driven to rotate by a power plant. According to the internal conical spoke-type shield drive head unit capable of easily changing the cutter, spokes are arranged in a conical shape, and due to the fact that the knife rest arms are capable of sliding on a guide rail, replacement of the cutter is more convenient and fast, and thus insufficiency of a shield tunneling machine in the prior art is solved.