The present invention relates to an organic soil builder, conditioner and/or biofertilizer, and to the production method thereof, which organic soil conditioner and/or biofertilizer has an organic base that allows the availability of nutrients in the soil to be increased for use when the plant requires, or the recovery of degraded soils. The method of the invention uses any type of animal waste sludges together with dry matter and granulated minerals. This mixture is fermented for 40 to 210 days, thus obtaining the organic soil builder, conditioner and/or biofertilizer of the invention.
