Preparation method for magnetic macromolecule nanoball

The invention provides a preparation method for a magnetic macromolecule nanoball. The preparation method comprises the following steps of: adding ferric chloride hexahydrate and iron dichloride tetrahydrate into water to prepare a mixed solution, dropwise adding ammonia water and a polyethylene glycol-4,000 aqueous solution for reaction, and carrying out ultrasonic dispersion and magnetic separation after reaction to obtain a Fe3O4 nanopraticle magnetic fluid; mixing the Fe3O4 nanopraticle magnetic fluid with absolute ethyl alcohol, the water and the ammonia water, dropwise adding tetraethyl orthosilicate after ultrasonic dispersion, carrying out magnetic separation after room-temperature reaction, collecting sediment and immersing the sediment in a hydrochloric acid solution, and carrying out magnetic separation after immersion to obtain a Fe3O4 composite nanopraticle magnetic fluid; and adding the Fe3O4 composite nanopraticle magnetic fluid into the absolute ethyl alcohol, adding the ammonia water after magnetic separation, dropwise adding 3-aminopropyltriethoxysilane for reaction, and carrying out magnetic separation after reaction to obtain the magnetic macromolecule nanoball. The method can be continuously and rapidly carried out, the time cost is low, the operation stability is high, the prepared magnetic macromolecule nanoball has excellent superparamagnetism, and magnetism is easy to separate and recycle.