Preparation method of antibacterial flame-retardant sound-insulation heat-insulation polyester staple fibers

The invention relates to a preparation method of polyester staple fibers, in particular to a preparation method of antibacterial flame-retardant sound-insulation heat-insulation polyester staple fibers. The preparation method of the antibacterial flame-retardant sound-insulation heat-insulation polyester staple fibers comprises the following steps of: preparing nano-silver antibacterial master batches; preparing phosphorus halogen-free flame-retardant master batches; weighing the nano-silver antibacterial and flame-retardant master batches and carrying out combination drying on the nano-silver antibacterial and flame-retardant master batches and a recycled polyester raw material; after melting and filtering the dried raw materials, pumping melt to a liquid-phase hardening-tempering and viscosity-regulating reaction kettle; carrying out spinning on the melt subjected to liquid-phase tackifying and filtering; carrying out post processing on as-formed fibers after balancing; and finally, cutting and packaging filament tows. The preparation method of the antibacterial flame-retardant sound-insulation heat-insulation polyester staple fibers, which is provided by the invention, has strong operability, reasonable process and high production efficiency and can be used for implementing the industrial mass production.