The invention relates to a combined method for producing p-xylene. The problems of long flow, huge investment, strict requirements on reaction raw materials, low heavy component recycling rate and high energy consumption of a conventional combined arene device are mainly solved. According to the technical scheme, the method comprises the following steps: causing products with 6 carbon atoms and more than 6 carbon atoms from a reformer and hydrogen to enter a catalytic hydrogenation unit, and performing non-aromatic hydrocarbon pyrolysis, heavy aromatic hydrocarbon dealkylation and transalkylation reaction to generate a mixture containing benzene, boluene, C8 aromatic hydrocarbon, C9 aromatic hydrocarbon and C10 aromatic hydrocarbon; causing the mixture to sequentially enter a benzene tower, a boluene tower and a xu;eme tower for adsorptive separation; causing the boluene to enter a crystallization unit, causing the boluene-containing C8 aromatic hydrocarbon to enter an isomerization unit, and returning obtained mixed boluene to return to a heavy aromatic hydrocarbon tower for separation; causing the boluene to enter the crystallization unit, obtaining a p-xylene product and C8 aromatic hydrocarbon, and returning the C8 aromatic hydrocarbon to an adsorptive separation unit. According to the method, the technical problems are well solved, and the method can be used for the industrial production of p-xylene.