Organic fertilizer preparation method

The invention discloses an organic fertilizer preparation method. The organic fertilizer preparation method comprises S1, raw material excavating: determining if raw materials are in a semi-decomposed state and carrying out excavating when the raw materials are in a semi-decomposed state, wherein the raw materials comprise padding subjected to immersion in manure and urine and treading in a pen and the padding mainly comprises crop straws, weeds and branches and leaves, S2, raw material stacking: taking out the raw materials and carrying out stacking in a way that pyroligneous liquor is uniformly sprayed to the surface of each layer of the raw materials, a watering process is carried out on each n layers of the raw materials, after stacking, a fine soil layer with thickness of 3-6cm covers the surface of the stacked raw materials and pyroligneous liquor is uniformly sprayed to the fine soil, wherein n is an integer greater than or equal to 1, and S3, fermentation: carrying out fermentation for set time until the compost heap sinks to set height so that the raw materials are completely matured, wherein the product can be applied. The organic fertilizer preparation method can shorten organic compost making time and can realize multi-batch organic compost manufacture. The organic fertilizer preparation method has simple processes, guarantees compost quality, reduces an organic fertilizer application cost and improves organic fertilizer direct traceability.