Method for reducing content of sulphur in gasoline

The invention relates to a method for reducing content of sulphur in gasoline. The method for reducing the content of sulphur in the gasoline comprises the following steps: firstly carrying out fractionation on full range gasoline to obtain a light gasoline fraction and a heavy gasoline fraction; carrying out mercaptan removal treatment on the light gasoline fraction in an alkali extraction mercaptan removal unit; contacting the heavy gasoline fraction with a selective hydrodesulphurization catalyst for carrying out reaction, and regulating and controlling selectivity of the selective hydrodesulphurization catalyst after sulphurization is finished. The method for reducing the content of sulphur in the gasoline can be used for treating high-sulphur high-olefin catalytic gasoline, sulphur content of a product is less than 10mu g/g, octane loss is low, and gasoline yield is more than 99%. Compared with the prior art, the method for reducing the content of sulphur in the gasoline has the advantages that selectivity of the selective hydrodesulphurization catalyst can be improved, and olefin saturation factor is low and octane loss of the product is low while the sulphur content of a gasoline product is the same.