To provide a pelletizing system of synthetic resin requiring no manpower for once discharging pellets out of standard to the outside of the system in case of occurrence of pellets out of standard like defective form, capable of pelletizing by supplying again directly to a pelletizer, and extremely efficiently pelletizing, with good industrial operation point of view.

The pelletizing system of synthetic resin has a line recycling pellets discharged from the pelletizer and feeding to a pelletizer. As the synthetic resin, polypropylene, polyethylene, polystyrene can be used, with no specific restriction. For pellet recycling, for example, an ordinary pneumatic conveyer can be used. Provision of a recovering stock silo in the recycling line for temporarily storing the recycling pellets facilitates operation.