The invention discloses a process for changing phenolic nitrate effluent into useful material by extracting, evaporating, crystallizing and coupling, belonging to the field of changing waste water into useful materials. The process comprises the steps of pre-treating waste water, extracting phenol, performing triple effect evaporation and recycling sodium sulfate. Phenol is extracted with ricinoleic acid and is recycled, so the industrial usage of the phenol is decreased. The oil-water mutual solving problem is efficiently solved by utilizing the salting-out effect of the sodium sulfate highlycontained in the waste water. By adopting triple effect evaporation of counter-current operation under a basic condition, the phenol is efficiently prevented from secondarily returning into air, so the phenol contained in the treated waste water is less than 0.5mg / l and can be used as the scouring water for preparing process or can be directly discharged. The by-product sodium sulfate solid is efficiently recycled and the purity of the sodium sulfate is above 99.9%. The produced sodium sulfate makes up for the steam consumption during the evaporation process. Furthermore, the process has theadvantages of low treating cost, economic benefit and obvious environmental benefit.