The invention relates to an acid pickling method for hot-rolled dual-phase steel, and belongs to the field of metallurgy. The continuous acid pickling method for the hot-rolled dual-phase steel sequentially includes the steps of hot-rolled raw material uncoiling, laser welding, withdrawing and straightening unit scale breaking, turbulent flow acid pickling, bleaching and online leveling. In the turbulent-flow-acid-pickling working procedure, the single-acid environment is adopted for acid pickling, acid pickling temperature ranges from 55 DEG C to 85 DEG C, and acid pickling is carried out in at least three stages. The acid pickling conditions in the stages are controlled, wherein in the first acid pickling process, the concentration of Fe<2+> in an acid pickling tank is smaller than or equal to 150 g/l, and the concentration of single acid ranges from 50 g/l to 120 g/l; in the second acid pickling process, the concentration of Fe<2+> in the acid pickling tank is smaller than or equal to 120 g/l, and the concentration of the single acid ranges from 60 g/l to 160 g/l; and in the third acid pickling process, the concentration of Fe<2+> in the acid pickling tank is smaller than or equal to 80 g/l, and the concentration of the single acid ranges from 80 g/l to 200 g/l. The technological steps are simple and practicable, acid liquor can be recycled, and certain environmental protection performance is achieved; and the acid pickling method has the beneficial effects of being capable of achieving continuous mass production, high in acid pickling efficiency and low in acid pickling cost.