Manufacturing method of melt direct-spinning high-strength polyester filament yarn

The invention relates to a manufacturing method of melt direct-spinning high-strength polyester filament yarn. The manufacturing method specifically includes the following steps of 1, preparation of high-strength powder; 2, preparation of high-strength polyester master batches; 3, preparation of the melt direct-spinning high-strength polyester filament yarn, wherein a melt direct-spinning online adding pump-front injection system is adopted, the high-strength polyester master batches prepared in the step 2 serve as pump-front injection raw materials, conventional polyester melt serves as main melt, multi-special-shaped-structure functional master batch melt with far infrared and negative ion emission functions is mixed with the main melt through the pump-front injection system, pre-spinning filtering is conducted, the mixture enters a spinning assembly for melt spinning, cross air blow cooling, oiling, drafting and winding are conducted, and the melt direct-spinning high-strength polyester filament yarn is ob