The invention relates to a method for preparing installation degraded soil remediation agent, which belongs to the field of bacterial manure preparation. The method uses matured chicken manure, zeolite powder and pulverized lignite which are widely available and low in cost as a carrier, sprays bacillus megaterium, bacillus subtilis and silicate bacteria which have already been widely used and play a role in phosphate-solubilization and potassium-solubilization and azotobacteria which plays a role in nitrogen fixation onto the carrier, and produces the degraded soil remediation agent by a method of pan granulation and low-temperature drying. The method adopts a simple process, produces products with high performance and quality at low cost, solves the serious soil degradation problem caused by use of a large amount of disinfectant and improves the utilization rate of fertilizer, thereby improving crop output during agricultural facility production.