Low-dielectric glass fiber and preparation method thereof, glass fiber product, composite material and application

The invention provides a low-dielectric glass fiber and a preparation method thereof, a glass fiber product, a composite material and application. The low-dielectric glass which is high in mechanical strength, good in dielectric property, simpler and more convenient in melting process and excellent in comprehensive performance is obtained by reasonably adjusting the proportion of oxides in glass components. Specifically, by reasonably setting the proportion of silicon oxide, aluminum oxide and boron oxide, the glass fiber has lower dielectric constant and dielectric loss, the viscosity of the glass is properly adjusted, and meanwhile, on the premise of considering the dielectric property and the mechanical strength, by reasonably setting the dosages of alkaline earth metal oxide, alkali metal oxide, TiO2, CeO2 and SnO2, the melting and clarifying performances of the glass are further improved, the wiredrawing forming temperature is lower, the stability and the yield are higher, the density is lower, and the g