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1. A magnetic dressing configured for targeted therapy, comprising: a magnetic layer, a drug-loading layer, and a protective layer that are stacked in sequence, wherein the magnetic layer comprises polyvinyl alcohol, gluten, and iron particles; a swallowed magnetic dressing is controlled by an external magnetic field, and the magnetic dressing is moved to a pathological position by changing a direction of the external magnetic field, thereby achieving a fixed-point release of a drug; the magnetic dressing appears a ring shape under an action of the external magnetic field, and the ring shape makes the magnetic dressing enter the human body by swallowing; after removing the external magnetic field, the magnetic dressing changes from the ring shape to a sheet shape, completing attachment of an entire lesion surface to complete a treatment by conducting autonomous drug release; the magnetic layer as an inner side and the drug-loading layer as an outer side are bent on a cylindrical surface, and magnetization is conducted; and the magnetization enables the magnetic layer to have a specific magnetization curve, enabling swallowing and delivery of the dressing, wherein raw materials of the magnetic dressing are biodegradable and after the magnetic dressing is removed from the affected parts a permanent magnet is removed to terminate the treatment, and wherein the magnetic dressing is naturally degraded in the human body.
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