The invention provides ecological heat preservation cotton and a production technology thereof. The ecological heat preservation cotton has the good windproof and water-repellent effect and has the certain sterilization function, and the heat preservation effect is better. The ecological heat preservation cotton comprises a heat preservation cotton core, a waterproof breathable layer and a soft close-fitting layer, the heat preservation cotton core is manufactured by mixing 30% of Sorona polymer fiber, 30% of superfine heat preservation fiber, 30% of three-dimensional hollow heat preservation fiber and 10% of native cotton fiber, the waterproof breathable layer is manufactured by mixing 70% of collagenous fiber and 30% of meldable fiber, the waterproof breathable layer is coated with a nanometer silicon particle treatment layer, the treatment layer is coated with a fluorine quaternary amine silane coupling agent coating, a sterilization layer is arranged between the soft close-fitting layer and the heat preservation cotton core, the soft close-fitting layer is fixed to the inner side of the sterilization layer in a flocking mode, and the soft close-fitting layer is composed of short fiber with the length being 0.05-0.2 cm. The manufacturing technology of the ecological heat preservation cotton comprises the steps of automatic machine blending mixing, opening, carding, lapping, glue spraying, heat setting and lap formation..