The invention discloses a slow-release water-retention compound fertilizer composition, and relates to the technical field of fertilizer. The slow-release water-retention compound fertilizer composition is prepared from compound organic matter, microelements, compound culture, degradable cross-linking agent, waxy corn starch, phosphoric acid esterified starch, carrageenan, shell powder of 40-60 mesh, palm fiber with the length of 600-800 micrometers, palygorskite powder of 40-60 mesh, compound foaming agent and compound coupling reagent. The slow-release fertilizer has high environment friendliness, water retention, slow release, applicability, fertilizer effect, soil improvement performance, prevention and control performance and yield increase, can better meet requirements of crops, further conform to the yearn for environment-friendly and multifunctional novel fertilizer by the market and has a good market prospect and competitiveness.