The invention discloses a preparation method and an application of a magnetic field induced pervaporation hybrid membrane, and belongs to the technical field of pervaporation membrane separation. Thepreparation method comprises the following steps: adding a polyether copolyamide solution to a magnetic nanomaterial dispersion in two steps, performing ultrasonic dispersion, and carrying out vacuumdefoaming to obtain a membrane casting solution; casting the membrane casting solution onto a glass plate, performing membrane scraping by a scraper, horizontally placing the glass plate in a blast drying oven having a vertical magnetic field, and drying the glass plate; and performing vacuum drying and membrane uncovering to obtain the pervaporation membrane. The structure of the pervaporation hybrid membrane prepared by the method is controllable, and introduced magnetic nanoparticles are enriched on the surface of the membrane to improve the adsorption selectivity of the membrane material to phenol and nitrophenol, and the magnetic nanoparticles in a polymer phase are arranged in an ordered manner under the action of the magnetic field in order to tend to form a diffusion channel for phenol and nitrophenol, so the pervaporation hybrid membrane has a good removal effect on phenol, nitrophenol and other trace volatile organic compounds in water.