The invention discloses a fluorescent powder composite particle and a preparation method and an application thereof. The surface of the fluorescent powder composite particle is coated with a cured silicone or epoxy resin. The preparation method comprises the following steps of S1, preparing a fluorescent powder glue; S2, performing vacuum treatment on the fluorescent powder glue obtained in step S1; S3, curing the fluorescent powder glue obtained in step S2 for 40-60min; S4, crushing the fluorescent powder glue obtained in step S3, so as to obtain the powdery fluorescent powder glue; utilizing a test sieve to sieve the powdery fluorescent powder glue, so as to obtain the composite particle with particle size of 20-38[mu]m. The method has the advantages that the method is simple and effective, the environment-friendly and economic effects are realized, the deposition of fluorescent powder in a white LED (light emitting diode) package is greatly inhibited, and the space color uniformity and optical consistency of an LED product are improved.