The invention relates to a method in the technical field of environmental protection, and in particular relates to a magnetic magnesium-based material doped composite film as well as a preparation method and application thereof. The method comprises the following steps : mixing nano-particles containing a magnesium material and magnetic nanoparticles for modification to obtain nanoparticles having the magnetic magnesium-based material; and performing heat activation on the nanoparticles of the obtained magnetic magnesium-based material, performing enhanced antibacterial modification treatment, and performing immersion precipitation phase inversion (NIPS) to obtain the magnesium-doped antibacterial film under the action of an additionally-applied electric field or magnetic field. According to the method provided by the invention, the magnesium-doped antibacterial film prepared by the method has a high water flux, biological pollution resistance and antibacterial property, and can be used for treating multiple kinds of wastewater.
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