Styrene polymerization inhibitor and use

The present invention provides a kind of composite polymerization inhibitor used in styrene rectifying process. The polymerization inhibitor is compounded with nitrogen-oxygen free radical compound and phenol compound in certain proportion. Owing to the synergistic effect of the two components, the polymerization inhibitor has obviously raised polymerization inhibiting effect compared with available polymerization inhibitor in the same concentration. In addition, it has low toxicity, great solubility and higher use temperature and is suitable for styrene rectifying process.