The invention discloses a zircon beneficiation composite reagent and a beneficiation method. Each ton of reagents for adding to crude ore comprises, by weight, 100-2000 g of sulfuric acid, 0-500 g of inhibitors and 100-1000 g of collecting agents. The inhibitors are sodium silicate, the collecting agents comprise petroleum sodium sulfonate and hydroximic acid, and a mass ratio of the petroleum sodium sulfonate to the hydroximic acid is 1:1-10. The zircon beneficiation composite reagent and the beneficiation method has the advantages that the zircon beneficiation composite reagent is good in zircon collecting property and selectivity, and the grade and the recovery of zircon concentrate can be further improved; the sodium silicate can be added to materials to be used as the inhibitors for fine silt or clay minerals when the materials contain few fine silt or clay minerals during flotation operation.