The invention is concerned with the regeneration method for non-sponge ink box of ink jet printer, includes the following steps: takes off the old sealing film of the ink inputting mouth, draws off the remainder ink in the ink box, cleans the ink outputting mouth, fixes the protective case for the ink outputting mouth in order th seal the outputting mouth, fillings the ink to the ink box from the ink inputting mouth, fixes the sealing-plug to the ink inputting mouth in order to seal the ink inputting mouth. The protective case is with a concave, the size and the shape of it determines by the ink outputting mouth. The size and shape of the sealing-plug bulge is fit for the ink inputting mouth.