Acidic soil adjusting fertilizer

The invention provides an acidic soil adjusting fertilizer which comprises the following components in parts by weight: 3-5 parts of calcium hydroxide, 13-18 parts of spiral seaweed, 10-12 parts of shell powder, 8-17 parts of peanut residues, 4-9 pars of moss thistles, 15-20 parts of saw dust, 3-7 parts of human fecaluria, 3-5 parts of calcium humate, 2-4 parts of potassium phytate, 8-13 parts of phosphogypsum and 200-400 parts of water. A preparation method of the acidic soil adjusting fertilizer comprises the following steps of: mixing the spiral seaweed, shell powder, peanut residues and moss thistles together; fully stirring the mixture for 10-20 minutes; then adding the rest of components to be uniformly mixed; and fermenting the mixture for 3-7 days; and overturning once time in the middle to obtain the acidic soil adjusting fertilizer. The raw materials are easily available, the cost is low, and the acidity of the soil can be adjusted by matching the spiral seaweed with the shell powder, and the fertilizer is suitable for growth of plants; the phosphogypsum provides phosphorus to growth of the plants so as to accelerate growth of the plants.