The invention relates to a synthesis method of 4-(4-aminophenyl)-3-morpholone disclosed as Formula (6), which comprises the following steps: reaction B: carrying out hydrogenation reduction on a compound 2 to obtain a compound 3; reaction C: reacting the compound 3 with tert-butyloxycarbonyl chlorine in the presence of an alkaline matter in a nitrogen protective atmosphere to obtain a compound 4; reaction D: reacting the compound 4 with chloracetyl chloride in the presence of an inorganic alkali to obtain a compound 5; and reaction E: removing the BOC protective group from the compound 5 to obtain the compound 6. The synthesis method of the rivaroxaban intermediate 4-(4-aminophenyl)-3-morpholone has the advantages of cheap and accessible raw materials, milder reaction conditions and higher yield, and is suitable for industrialization.