As a nano-scale composite functional material, the basic structure of the new magnetic fluid is to uniformly disperse the magnetic solid particles adsorbed with surfactants into the base liquid, thus forming a stable colloid system with high dispersion. Magnetic fluid can exist stably for a long time even under the action of gravity field, magnetic field and electric field without precipitation and separation. This kind of magnetic fluid has both magnetic and liquid fluidity under the action of

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... magnetic field, so it has great potential for the application of magnetic fluid in the field of sensors. This paper mainly analyzes the research achievements of magnetic fluid in the neighborhood of micro-differential pressure sensor at home and abroad in recent years, and introduces the working principle and latest research progress of magnetic fluid sensor. Thus, making use of the special properties of magnetic fluid, it is applied to some problems in the field of micro-pressure difference sensor and the research direction of magnetic fluid micro-pressure difference sensor in the future.