A facile method to recycle wasted expandable polystyrene (WEPS) into graphite polystyrene bead (GPS) is described in this paper. The recycled beads were characterizied by FTIR, SEM, TGA, GPC and XRD, and the results showed that the molecular weight (Mn) was equal to 99.25% of the standard polystyrene and there was no decline in thermal stability. This method provided several advantages such as easy operation, low energy consumption, low contamination, high purity and high yield of product.