The invention discloses a recycling method for mixed production wastewater of a sulfur-transfer agent and an FCC catalyst. The recycling method includes the following steps: 1) on the basis of the volume of wastewater, mixing 1 part of sulfur-transfer agent production wastewater with 0.2-5 parts of FCC catalyst production wastewater to prepare the mixed production wastewater of the sulfur-transfer agent and the FCC catalyst; 2) adding a sulfur-transfer agent fine powder, as a settling additive, to the mixed production wastewater to prepare a mixed turbid liquid, wherein on the basis of the volume of the mixed production wastewater, the addition amount of the sulfur-transfer agent fine powder is 1-15 g/L; 3) controlling the pH of the mixed turbid liquid to be 2-6; 4) performing first-stage solid-liquid separation treatment to the mixed turbid liquid to obtain a first-stage clean liquid and a first-stage heavy phase and/or settled residue; 5) performing secondary solid-liquid separation treatment to the first-stage clean liquid to obtain a secondary clean liquid and a secondary heavy phase and/or settled residue; and 6) sending the secondary clean liquid into the production process of the sulfur-transfer agent for cyclic utilization. By means of the method, rare earth elements dissolved in the mixed production wastewater can be recycled, so that the method not only recycles resources but also reduces environment pollution.