A flexible annular conveying device comprises a guide rail frame assembly (1), one or more self-adaptive guide material containing cart assemblies (2) and a power and transmission assembly (3). The self-adaptive guide material containing cart assemblies (2) are embedded into deep groove guide rails (14) of the guide rail frame assembly (1) through guide wheels (223) and connected with a chain (331) in the power and transmission assembly (3) through fixing connectors (213). Through the adoption of the technology, production materials can be conveyed efficiently, accurately and continuously, the flexible annular conveying device can well adapt to different work environments and conditions, material conveying work efficiency is effectively improved, and material conveying quality is guaranteed.