The article reviews the development and application of flexible wearable sensors in crop monitoring, emphasizing their advantages over traditional rigid sensors in terms of non-invasiveness, biocompatibility, and real-time monitoring capabilities. Flexible sensors are made from materials with excellent mechanical properties and biocompatibility, allowing them to be integrated into crops without causing damage. The review covers the key technologies involved in the preparation of flexible wearable sensors, including substrate and functional materials, and advanced manufacturing processes such as lithography, printing, and roll-to-roll manufacturing. The article highlights the monitoring functions of flexible sensors in crop growth, including nutrient, physiological, ecological, and environmental information. It also discusses the challenges and future opportunities in the field, such as new sensing theories, materials, structures, wireless power supply, and agricultural sensor networks. The review concludes by emphasizing the potential of flexible wearable sensors in smart agriculture, providing efficient management of agricultural production and resources.The article reviews the development and application of flexible wearable sensors in crop monitoring, emphasizing their advantages over traditional rigid sensors in terms of non-invasiveness, biocompatibility, and real-time monitoring capabilities. Flexible sensors are made from materials with excellent mechanical properties and biocompatibility, allowing them to be integrated into crops without causing damage. The review covers the key technologies involved in the preparation of flexible wearable sensors, including substrate and functional materials, and advanced manufacturing processes such as lithography, printing, and roll-to-roll manufacturing. The article highlights the monitoring functions of flexible sensors in crop growth, including nutrient, physiological, ecological, and environmental information. It also discusses the challenges and future opportunities in the field, such as new sensing theories, materials, structures, wireless power supply, and agricultural sensor networks. The review concludes by emphasizing the potential of flexible wearable sensors in smart agriculture, providing efficient management of agricultural production and resources.