The invention relates to a method for production of a high-activity soil conditioner and co-production of a sulfuric acid employing phosphorus gypsum and potassium feldspar. The method comprises the following steps: (1) naturally airing, drying, crushing and sieving phosphorus gypsum, crushing, grinding and sieving potassium feldspar, and grinding and sieving sodium sulfate; (2) mixing the sieved phosphorus gypsum, potassium feldspar and sodium sulfate, adding coal and mixing evenly, so as to obtain a mixture; (3) adding water to the mixture, so as to prepare a spherical material or a block material; (4) sintering the spherical material or the block material at 900-1100 DEG C for 1-3 hours, so as to prepare a sintered clinker; and (5) crushing, grinding and sieving the sintered clinker, adding biochemical fulvic acid potassium powder, mixing evenly, and packaging to obtain a soil conditioner product, and introducing a tail gas in the step (4) into a sulfuric acid preparation system after cooling and removing dust, so as to prepare the sulfuric acid. The residue phosphorus gypsum from acid preparation of phosphate ore is reasonably utilized, and waste is changed into treasures, so that the maximal economic benefits are generated.