In recent years, the development of flexible supercapacitors has become one of the research hotspots in the field of electrochemistry. The selection and design of electrode materials are critical to improving the performance of flexible supercapacitors. In the past few years, researchers have continuously explored and developed various new electrode materials to meet the needs of flexible supercapacitors for high energy density, high power density, long cycle life, and good flexibility and fabricability. The article summarizes common electrode materials including carbon-based materials with high conductivity, metal oxides with high theoretical capacitance, environmentally friendly organic electrode materials, metal-organic frameworks (MOFs) with unique structures and excellent electrochemistry, and Emerging two-dimensional transition metal carbon/nitride materials (MXene), etc. Research progress in flexible supercapacitors presents some current challenges faced by the field and looks forward to future development prospects. Despite significant progress, there are still some pressing issues that need to be addressed. As the research on flexible supercapacitors continues to deepen and new electrode materials continue to emerge, it is believed that flexible supercapacitors will usher in more widespread applications in wearable electronics, smart medical care, wearable sensors and other fields.