The embodiment of the invention discloses a control method for the pitting defect on the surface of cold-rolled silicon-manganese dual-phase steel. The cold-rolled silicon-manganese dual-phase steel is produced through the procedures of slab heating, rough rolling, finish rolling, cooling, cold rolling, heat treatment and reeling in sequence. The control method comprises the steps that the silicon content and the manganese content of cold hard rolls after cold rolling are obtained; in the heat treatment process, the volume percent of hydrogen in the atmosphere is controlled to be 2-10%; and the dew point temperature of the atmosphere is controlled according to the silicon content and the manganese content. By means of the control method for the pitting defect on the surface of the cold-rolled silicon-manganese dual-phase steel, the technical problem that in the prior art, a pitting defect control method is poor in control effect is solved, and the technical effect that the pitting defect on the surface of the cold-rolled silicon-manganese dual-phase steel is effectively controlled is achieved.