Since its discovery, graphene has attracted widespread interest as a two-dimensional material composed of carbon atoms. It has a unique lattice structure and excellent properties, including high electrical conductivity, excellent carrier mobility, outstanding optoelectronic properties, excellent mechanical properties, chemical stability, and thermal conductivity. This makes graphene a great potential in the field of electrical and electronic devices. Graphene can be used in high-speed electronic devices, high-performance transistors, flexible displays, solar cells, photo detectors, and light sensors. This paper introduces the structure, properties, preparation, and characterization methods of graphene and its application in electrical and electronic fields, and summarizes its application potential and challenges in this field. All in all, graphene, as a material with unique properties, has broad application potential in the field of electronic and electrical devices and provides new opportunities for the development of electronic technology.