The invention discloses a super-large diameter shield cutterhead system used in a hard-soft heterogeneous ground. The super-large diameter shield cutterhead system comprises large-size cutterheads, a medium-size cutterhead, small-size cutterheads, spokes, a panel, a hob, a cutting knife, a leading knife, a center knife, a stirring rod, a reducer, a hydraulic motor, a power transmitting device, a shield and a spiral unearthing device; the front end cutterhead of the shield is nine cutterheads which are formed and arranged in a spatial crossing structure, and is divided into four-order cutterheads including the large-size cutterheads, the medium-size cutterhead, and the small-size cutterheads; the four-order cutterheads comprises a first-order cutterhead, second-order cutterheads, third-order cutterheads, and fourth-order cutterheads. According to the super-large diameter shield cutterhead system used in the hard-soft heterogeneous ground, multiple layers of cutterheads are distributed in a spatial crossing mode, each cutterhead can achieve individual control, and thus the excavation efficiency, precision and stability of the super-large diameter shield in construction of the hard-soft heterogeneous ground are improved. The use of a large diameter mainshaft bearing is prevented, and the manufacturing difficulty and transportation cost are lowered; through the adoption of the multiple layers of the cutterheads, loads of each part are lowered, and the service life of relevant parts of the cutterheads is prolonged.