Method for separating aromatic hydrocarbon and saturated hydrocarbon in catalytic cracking oil slurry through composite solvent

A method for separating aromatic hydrocarbon and saturated hydrocarbon in catalytic cracking oil slurry through a composite solvent comprises the following steps: the catalytic cracking oil slurry in a storage tank enters a first extraction tower, a solvent I enters the first extraction tower, an asphaltene component flows out from the bottom of the first extraction tower, deasphalted oil and the solvent I flow out from the top of the first extraction tower, and then enter a first solvent recovery tower to obtain deasphalted oil, wherein the solvent I is recovered to a storage tank for recycling; then the solvent II in the storage tank and the solvent III in the storage tank are pumped into a mixing tank to obtain a composite solvent, enabling the composite solvent to enter a second extraction tower, the deasphalted oil enters the second extraction tower, the deasphalted oil and the composite solvent reversely contacts in the second extraction tower, a saturated hydrocarbon component flows out from the top of