The utility model discloses an offshore platform lean glycol storage and conveying system. The system comprises an offshore platform, and guide tube frame legs of the offshore platform are communicated with nitrogen tanks through nitrogen input pipelines. The guide tube frame legs of the offshore platform are respectively communicated with lean glycol input pipelines and lean glycol output pipelines, and the lean glycol output pipelines are communicated with lean glycol daily tanks. The guide tube frame legs are used for storing lean glycol, a large storage tank does not need to be arranged on the upper portion module of the offshore platform, and therefore platform space is saved, and the equipment layout of an upper deck is optimized. The steel use amount of guide tube frames is reduced, and the hoisting weight of the upper portion module of the platform is reduced. When the system is used, the difficulty of fire safety and production and operation security risks can be lowered. Project investment is saved.