The invention discloses an encapsulating method of a blue-light LED chip, which comprises the following steps: photosensitive resin liquid which is sensitive to blue light is prepared; an LED semi-finished product is presoaked in the photosensitive resin, the LED semi-finished product is then reversely soaked in the photosensitive resin liquid, the edge of a chip basal plate is immersed in the photosensitive resin, low working current is introduced to the LED chip to cause the LED chip to irradiate; the photosensitive resin is triggered to occur primary polymerization, and a photosensitive resin core is formed on a light-emitting surface of the LED chip; the LED semi-finished product is caused to slowly ascend to separate the liquid surface of the photosensitive resin, and a semispherical or approximately-semispherical photosensitive resin liquid drop is attached on the photosensitive resin core and a chip base; medium working current is introduced to the LED chip to cause the LED to irradiate so that the photosensitive resin liquid drop is excited to be solidified; high working current is introduced to a sample of the photosensitive resin liquid drop after being solidified so as to cause the LED chip to irradiate, solidification and decolorization are further carried out, or the sample is decolorized through sunshine insolation or through purple light irradiation; and finally the sample after being solidified and decolorized is cleaned.