The utility model discloses a naphthalene scrubbing system for a primary cooler. The system comprises a scrubbing liquid groove (2), wherein the scrubbing liquid outlet of the scrubbing liquid groove (2) is connected with the scrubbing liquid inlet of the primary cooler (1) through a naphthalene scrubbing pump (3); and the scrubbing liquid outlet of the primary cooler (1) is communicated with the scrubbing liquid inlet of the scrubbing liquid groove. Due to the adoption of the technical scheme, the naphthalene scrubbing effect is improved remarkably, the increase of resistance is slow, the scrubbing period of the primary cooler is prolonged from once every two months to once every half year, the operation flow is improved, the labor intensity is lowered, and stable production is facilitated.