The invention discloses a preparation method of 
moisture-absorbing heating fibers containing 
plant extracts and having an antibacterial function, which comprises the following steps: step 1, preparation of a 
spinning solution: mixing 
cellulose pulp with 
alpha cellulose according to a weight ratio of 1: 2, then adding 10-18% of a composite modified additive, stirring at a high speed by using a stirrer to realize blending to prepare a blended 
spinning solution, and standing, defoaming, and 
ripening for later use; and 2) 
spinning and forming: in which the spinning solution obtained in the first step is treated through a 
metering pump and a filter, the spinning speed is preset, the spinning solution is sprayed out through a spinning 
nozzle, enters a coagulating bath and reacts with reagents in the coagulating bath to be cured, and formed 
fiber bundles need to be stretched through a drafting roller firstly and then subjected to post-
processing treatment. The product is fine, soft, 
moisture-preserving, breathable, non-irritating to 
skin affinity, excellent in 
moisture absorption and heating performance and 
antibacterial property, green, environment-friendly, biodegradable, free of 
heavy metals and harmful chemicals, safe and non-dissolving out; and the 
fiber has high 
moisture regain and high hygroscopicity.