The invention discloses a core-shell magnetic heavy metal contaminated soil remediation material and a preparation method and application thereof. Soaking magnetite in dilute sulfuric acid, roasting at high temperature, and cooling to obtain core-shell magnetic heavy metal contaminated soil remediation material with magnetite core and hematite shell with porous structure. The surface of the material is loose porous hematite, has large specific surface area, greatly increases adsorption active sites, and has strong magnetism. After the core-shell magnetic heavy metal contaminated soil remediation material is fully and uniformly mixed and contacted with the heavy metal contaminated soil, the remediation material is separated from the soil by magnetic separation, so that the heavy metal contaminated soil can be effectively remedied. The preparation method of the core-shell magnetic heavy metal contaminated soil remediation material has simple operation, low production cost and controllable process, and meets the requirements of large-scale industrial production and popularization.