Clayed soil improvement agent

The invention relates to a clayed soil improvement agent. The clayed soil improvement agent is mainly prepared by compounding the following raw materials by mass percent: 40-60% of sand, 15-25% of organic fertilizer and 25-35% of waste matrix. The clayed soil improvement agent has the advantages that firstly mechanical composition and texture of soil can be improved, physical and chemical properties of clayed soil can be improved, fertilizer utilization rate can be increased, and crop growth environment can be improved; secondly, after the clayed soil is applied, soil bulk density is reduced by 5.2%, ventilation porosity is increased by 31.5%, soil organic matter is increased by 18.6%, soil alkali-hydrolyzable nitrogen is increased by 5.9%, and rapidly available phosphorus is increased by 8.4%; and thirdly, raw material resources are rich, a manufacturing process is simple, the clayed soil improvement agent is easy to use in the field, production cost is low, and no side or toxic effect is produced.