The magnetism of a substance refers to the property of being able to excite a magnetic field and be subjected to a force in the external magnetic field, which is an intrinsic property of the substance, and almost all substances are magnetic to a greater or lesser extent. The study of magnetic materials started from the study of permanent magnets, and the natural magnetite (Fe3O4) is the earliest permanent magnet discovered and applied by human beings. Ferromagnets are widely used due to their strong magnetic properties and unique magnetization properties. Many magnetic materials have special effects, such as magneto-optical effect, magnetic force effect, magneto-thermal effect and magneto-*** vibration phenomenon, etc. These special effects have important applications. In today's national economy, or even in many basic areas of society, magnetic materials occupy a key position, especially in the electric power industry and electronics industry. Since magnetic materials play a role in energy conversion, the amount of magnetic materials needed is enormous. In addition, magnetic applications are increasingly being used in the fields of energy, transportation, agriculture, medicine, and human consumption in daily life. The following examples illustrate the application of magnetic materials in social life and application prospects.