Composite fluorescent material and preparation method thereof and prepared fluorescent PVC material

The invention discloses a composite fluorescent material and a preparation method thereof and a prepared fluorescent PVC material. The composite fluorescent material is prepared from the following components through a heating reaction: cerous nitrate, lanthanum nitrate, acetic acid, pyromellitic dianhydride, ethylenediamine and 0.05-0.6 part of a manganese sulfate catalyst. The fluorescent PVC material provided by the invention comprises PVC and the composite fluorescent material. According to the invention, the polymer-inorganic composite fluorescent material with block characteristics is constructed by combining the luminescence mechanisms of an organic fluorescent material and an inorganic fluorescent material, and due to the existence of a fluorescent polymer chain segment, the compatibility of the polymer-inorganic composite fluorescent material and a PVC matrix is good; a rare earth light-emitting element is reacted and combined with an acidic group of an organic matter, so that the material has better