Chelation stabilizer suitable for liquid-phase oxidation process

The invention discloses a chelation stabilizer suitable for a liquid-phase oxidation process. The stabilizer is prepared from a free radical scavenger, an antioxidant and a synergist in a compounding mode. The free radical scavenge is one or more of benzoate, phenylacetate and salicylic acid; the antioxidant is one or more of ascorbic acid, scorbic palmitate, erythorbic acid and sodium erythorbate; the synergist is prepared from citric acid and long-chain or branched-chain organic acid of isocitric acid. The chelation stabilizer can relieve degradation of a chelating agent in the desulfuration process, reduce chelating agent consumption and lower the operating cost of a desulfuration device.