Disclosed are a full-spectrum light emitting diode (LED) and applications thereof. A fluorescent powder composition is mixed with silica gel. In the mixture of the fluorescent powder composition and the silica gel, the mixture of the fluorescent powder composition and the silica gel is applied on blue LED chips. The blue LED chips are blue light emitting diode chips, and at least two blue LED chips are provided. The fluorescent powder composition includes fluorescent powder of at least two different colors. An excited spectrum is close to a plant photosynthesis curve, a meat irradiation curve, a biological growth curve, a seafood irradiation curve, a vegetable and fruit irradiation curve, and a pastry irradiation curve. A full-spectrum LED light source can be adjusted to simulate natural light irradiation. The excited spectrum is close to the plant photosynthesis curve, thereby causing photosynthesis in plants, achieving an optimal plant growth effect. Further, the present invention achieves optimal freshness preservation effects in meat irradiation, seafood irradiation, and vegetable and fruit irradiation, and ensures optimal deliciousness in pastry irradiation.