The invention provides a method for producing high octane gasoline by aromatization reaction of a mixed raw material of catalytic gasoline and C4, and catalyst on an aromatization reactor after the mixed raw material contacts the catalyst. The method is as follows: the catalytic gasoline is mixed with the C4 olefin, and the mixed raw material enters into a fixed bed aromatization reactor or a simulated moving bed aromatization reactor which is filled with the molecular sieve catalyst, contacts the aromatizing catalyst, and undergoes olefin aromatization reaction, wherein the reaction conditions are as follows: the reaction temperature is between 250 and 340 DEG C; the pressure is between 0.5 and 3.0 MPa; the weight space velocity is between 0.5 and 10h<-1>; the mass ratio of the C4 olefin to the catalytic gasoline is between 90 to 10 and 2 to 98; and active ingredients of a molecular sieve carrier of the catalyst are one or more than one among rare earth element, No. 4B element and No. 8 element, and the weight of the active ingredients is 0.01 to 10 percent of that of the carrier. The method can obviously reduce the olefin content of the raw gasoline, effectively improve the octane number, and achieve the aim of production of the clean high-octane gasoline.