Currently, storage theory has been widely adopted but rarely used in procurement decision-making of construction, especially in green landscaping engineering. Seedlings storage is different from other general products for their survival rates will exert direct impact on the project quality and progress. Therefore, it is very important for those green landscaping manufacturing engineering companies to adopt scientific methods to store seedlings. This article establishes mathematical model of seedlings storage through in-depth analysis of practical manufacturing engineering problems and applies mathematical model to providing analysis and solutions to the problem using the storage model theory against the background of limited storage capacity. Finally, the optimal seedlings procurement strategy has been set up to save costs for enterprises to the maximum extent under the context of limited storage capacity. This conveys some application value for green landscaping engineering companies when make scientific procurement decision.