The invention discloses a fluorine phlogopite glass-ceramic of melting and casting tailings and a preparation method thereof. According to different application requirements, fluorine phlogopite glass-ceramic insulation products with various structures are prepared by integral molding process. The product produced by the casting method has good machinability, excellent electrical insulation, small dielectric loss, stable dielectric constant, high mechanical strength, high temperature resistance, acid and alkali resistance, and good thermal shock resistance. Utilizing the method of the present invention to prepare fluorophlogopite glass ceramics is to organically combine the processes of melting, forming, annealing, nucleation, and crystallization, which can effectively control product quality, and the process is simple and easy to operate, and can realize fluorine gold The automatic production of mica insulation material has high economic and benefit.