Method for preparing ecological fertilizer from sludge

The invention relates to the field of the preparation of ecological fertilizer, and particularly relates to a method for preparing ecological fertilizer from sludge, which effectively overcomes the weaknesses and defects of the existing sludge treatment and utilization process. According to the technical scheme, the method comprises the following steps: step 1, pretreating the sludge; step 2, carrying out standardization treatment on the sludge; and step 3, carrying out blocking treatment on heavy metal. The produced sludge ecological fertilizer is granular and capable of independently existing after being applied to the soil for a period of time. Compared with other technologies, by utilizing the method for preparing the ecological fertilizer by virtue of sludge, not only are various nutrients in the sludge adequately utilized, but also the improvement of soil can be realized, the favorable natural circulation is promoted, the method is an optimal technical route of the economical low-carbon resource cyclic utilization at present, the method has advantages of ecological circulation and economical cost, and the low-carbon development trend in the future can be satisfied.