The present invention relates to a soil improving product for crop growth for mixing a functional material which includes 1-5 weight% of PMAA, 1-3 weight% of seaweed extract, and 1-3 weight% of mound lily； with a main material which includes 60-70 weight% of natural calcium sulfate, and 20-30 weight% of zeolite； spraying 1-2 weight% of microbial agent in the mixed powder, and having a granulation and a manufacturing method thereof. The present invention is capable of using as an environmental friendly organic material in which a harmful material is not detected by mixing the function material which includes PMAA, seaweed extract, and mound lily with the main material which includes natural calcium sulfate and zeolite, spraying the microbial agent in the mixed powder, and having the granulation. Furthermore, the present invention is capable of entirely restoring the soil depth without damage due to the repeated cultivation by decomposing the material inside the soil by actively spreading the microorganism； improving the movement of a material inside the soil and a root respiration by improving the fertility of soil； accelerating the growth of a crop by smoothly processing the nutrient uptake of the root； enhancing the water permeability, water-retentive property, nutrient holding capacity； and increasing the harvest by fulfilling an essential component of the crops. [Reference numerals] (S10) Inserting natural calcium sulfate and zeolite in a mixer after weighing the required amount； (S20) Inserting PMAA, seaweed extract, and mound lily in the mixer after weighing the required amount； (S30) Mixing； (S40) Spraying a microbial agent and having a granulation； (S50) Drying； (S60) Selecting； (S70) Packaging본 발명은 주원료인 천연황산칼슘 60∼70중량%, 제올라이트 20∼30중량%를 혼합기에 투입하는 단계와, 상기 혼합기에 기능성 물질인 폴리메틸아스파르틱산(PMAA) 1∼5중량%, 해조추출물 1∼3중량%, 유카 1∼3중량%를 투입하는 단계와, 상기 혼합기에 투입된 주원료 및 기능성 물질을 교반 혼합하여 혼합분말을 형성하는 단계와, 상기 혼합분말을 과립기에 통과시키면서 아스퍼질러스 오리제 1종 1∼2중량% 를 분사하여 과립성형물을 형성하는 단계와 상기 과립성형물을 45℃의 온도에서
