The present invention provides a pretreatment method for coking gasoline before hydrogenation. According to the method, coking gasoline is cut into a light distillate and a heavy distillate, wherein mercaptan sulfur compound content is high while basic nitride content is low in the light distillate oil, and mercaptan sulfur compound content is low while basic nitride content is high in the heavy distillate oil, such that a liquid alkali with a mass percentage concentration of 10-30% is adopted to remove active mercaptan sulfur from the light distillate, and a macroporous strong acid cation exchange resin is adopted to carry out a basic nitride removing treatment on the heavy distillate. According to the present invention, a mercaptan removing treatment is performed on the light distillate oil, a basic nitride removing treatment is performed on the heavy distillate oil, and the mercaptan removed light distillate oil and the basic nitride removed heavy distillate oil are blended to be adopted as a hydrorefining raw material so as to effectively avoid negative influence of scale accumulation of mercaptan sulfur and basic nitrides on a heat exchanger and a catalyst bed layer during a hydrodesulfurization process.