The invention provides a ball-injecting auxiliary well-washing pipe string comprising a casing pipe, a screen pipe, a packer, a packing cup and an oil production pipe string. Perforation shot holes are formed in the casing pipe, a first annular space is formed by the screen pipe and the casing pipe, plugging adjusting balls are accommodated in the first annular space, screen holes of the screen pipe do not allow the plugging adjusting balls to pass through and allow liquid to pass through; the packer is connected to the upper end of the screen pipe, the packing cup is connected to the lower end of the screen pipe, and the plugging adjusting balls are limited in the position, between the packer and the packing cup, of the first annular space; an oil pumping pump is arranged in the oil production pipe string, the oil production pipe string is arranged above the packer, and a second annular space is formed by the oil production pipe string and the casing pipe; and the oil production pipestring is internally provided with a check valve which communicates from bottom to top. According to the ball-injecting auxiliary well-washing pipe string, it can be ensured that a well-washing liquiddoes not flow into a stratum to pollute the stratum by utilizing the plugging adjusting balls to control the well-washing liquid in the process of well washing; in addition, the oil pumping pump in the oil production pipe string and the perforation shot holes in the casing pipe can further be cleaned simultaneously, normal circulating of the well-washing liquid is realized, and the pump inspection cycle is prolonged.