Biodegradable antibacterial fiber and preparation method thereof

The invention discloses a preparation method of a biodegradable antibacterial fiber. The preparation method comprises the following steps: (1) weighing dried matrix resin particles, an essential oil antibacterial agent and a lubricant; (2) fully mixing matrix resin, the antibacterial agent and the lubricant by using a high-speed mixer, adding the mixed raw materials into a screw extruder, extruding, cooling in an air bath, and curing into filaments; (3) feeding the cured filaments into a granulator, cutting the filaments into master batches, and drying the master batches in a vacuum drying oven for 12-24 hours; (4) feeding the dried master batches into an extruder, performing high-temperature extrusion through a screw to form a uniform melt, conveying the metered melt to a spinning assembly, spraying the melt from a spinning nozzle, enabling the melt to pass through an air bath with a certain height, entering a coagulating bath containing an antibacterial agent, performing curing forming, winding to obtain pr