Abstract: In order to study the green preparation technology of refined kaolin, taking sandy kaolin from Jiangxi as a research object, process mineralogy, iron removal and whitening by superconducting magnetic separation were studied. Different magnetic separation, magnetic intensity, dispersant dosage, feed rate, media size and pretreatment were mainly studied. Finally, "pre-electromagnetic separation - superconducing magnetic separation" was adopted. The refined kaolin with Fe₂O₃ content of 0.48%, whiteness of 93.4%, and yield of 60.08% was obtained, while the intensity of electromagnetic separation and superconcucing magnetic separation were 1.1 T and 4 T, respectively, and under the superconducing magnetic separation condition of dispersant dosage of 0.4%, feed rate of 0.8 cm/s, and 2# steel wool. This method has greatly improved the additional value of sandy kaolin.