The present invention provides a refining method of an alkylation feedstock. The method is as below: treating an alkylation feedstock containing impurity by a washing tower (1), a dewatering tower (2), a desulfurization tower (3), a dechlorination column (4), a denitrogenation column (5), an oxygenated chemicals removal column (6), a preheater (7), and a selective hydrogenation reactor (8) to obtain a purified alkylation feedstock. The refining method of the alkylation feedstock can effectively remove impurities such as sulfide, nitride, chloride and oxygenated chemicals in the alkylation feedstock, so that the alkylation feedstock has significantly reduced content of impurities, and solid acid catalyst poisoning in a subsequent alkylation reaction can be avoided. The method improve the catalytic activity and usage cycle of the alkylation solid acid, greatly reduces production costs and improves production efficiency.