The invention provides a star wheel bobbin rotary disc which is used for placing bobbins and providing paper for a molding machine. The star wheel bobbin rotary disc is composed of a rotary disc body, a gear transmission system, two bobbin supports and the like. The rotary disc body is composed of a detachable sealing metal casing, and the gear transmission system is composed of a motor, a central shaft, a plurality of groups of gears meshed or in linkage connection with one another, two transmission shafts and the like. Each bobbin support is formed by an eccentric supporting plate, a bobbin shaft, a bearing, a bobbin base, a braking assembly, a cover cap, an adjusting nut and the like. The rotary disc body can rotate around the central shaft, the motor can drive the central shaft, the gear and the two transmission shafts to rotate. Inner shaft holes of the eccentric supporting plates are sleeved on the transmission shafts, bearing inner rings are sleeved on the bobbin shafts, and bearing outer rings are connected with the bobbin bases in matching mode. The bobbins are arranged between the bobbin bases and the cover caps. The braking assemblies are used for controlling rotating or braking of the bobbin bases and the like, and the adjusting nuts are used for adjusting axial positions of the bobbins. The star wheel bobbin rotary disc is compact in components, small in rotary space, capable of replacing the bobbins automatically, good in splicing stability, and high in efficiency.