Packaging structure and packaging method for increasing utilization rate of LED excitation light source

The packaging structure comprises a luminous source, a lamp cup, a coating substance and a fluorescent substance, the lamp cup is of a structure with an open upper end, the luminous source is arranged at the inner bottom of the lamp cup, the coating substance is filled in the lamp cup and around the luminous source, and the fluorescent substance is arranged in the lamp cup. The coating substance is formed by distributing low-concentration high-reflection nano particles in a colloid matrix, the fluorescent substance is filled in the lamp cup and above the coating substance, and the fluorescent substance is formed by distributing luminous substances in the colloid matrix. According to the invention, the low-concentration high-reflection particles are utilized to enable the lateral light source to generate a refraction or scattering effect, and the light source is concentrated on the forward light, so that the utilization rate of the blue light is improved, the luminous intensity of the fluorescent substance is