The invention discloses a bactericidal softener for pure cotton fabrics, which comprises components A and B, component A includes components A, B and C, and its components include the following components in parts by mass: component A: hard 67-75 parts of fatty acid, 21-23 parts of diethylenetriamine as polyamine, 11-15 parts of diethylenetriamine; Component B: 9-11 parts of dimethyl sulfate, 7 parts of diethyl sulfate ‑9 parts, 6‑10 parts of epichlorohydrin, 5‑9 parts of diethyl sulfate; C component: 4‑8 parts of glycerol monostearate, 7‑15 parts of Tween, fatty alcohol polyoxyethylene ether 2‑6 parts; component B: 17‑21 parts of sorbitan stearate, 7‑13 parts of fatty alcohol polyoxyethylene ether, 12‑16 parts of baking soda, 13‑15 parts of sodium tripolyphosphate, ethanol 18-22 parts; the product of the present invention is safe, reliable, green and environmentally friendly, non-toxic, harmless and non-irritating to the human body, and the manufacturing process is simple and easy to operate, the raw materials are easy to obtain, and the production cost is low.