NOVELTY - Soil conditioning agent comprises clinker and dispersant, where the clinker used is potassium feldspar, dolomite, and anthracite coal as raw material; the mass fraction of Anthracite coal A is 7.5-9%; the mass fraction of potassium feldspar and dolomite is achieved by controlling raw material alkaline oxide and molar ratio of acidic oxide which is n = 1-1.25, in accordance with the equation: potassium feldspar ore content B = 1/(1+ alpha )x (100%-A), dolomite mass fraction C = 100%-A-B, where alpha is n/ Sigma (alkaline 1)- Sigma (acidic 1)/ Sigma (alkaline 2)- Sigma (acidic 2).    USE - Used as soil conditioning agent.    ADVANTAGE - The conditioning agent can provide large amount of potassium element required for the plant, can fix nitrogen element, phosphorus element and increase absorption, improves soil pH value, has low energy consumption, is economical, and uses valuable resource of potassium feldspar ore.    DETAILED DESCRIPTION - Soil conditioning agent comprises clinker and dispersant, where the clinker used is potassium feldspar, dolomite, and anthracite coal as raw material; the clinker each component total content is 100%; mass fraction of Anthracite coal A is 7.5-9%; the mass fraction of potassium feldspar and dolomite is achieved by controlling raw material alkaline oxide and molar ratio of acidic oxide which is n = 1-1.25, in accordance with the equation: potassium feldspar ore content B = 1/(1+ alpha )x (100%-A), dolomite mass fraction C = 100%-A-B, where alpha is n/ Sigma (alkaline 1)- Sigma (acidic 1)/ Sigma (alkaline 2)- Sigma (acidic 2), where Sigma (alkaline 1) is sum of mole number of alkaline oxide and potassium feldspar ore, Sigma (acidic 1) is sum of mole number of acid oxide and potassium feldspar ore, Sigma (alkaline 2) is sum of mole number of alkaline oxide and dolomite, Sigma (acidic 2) is sum of mole number of acidic oxide and dolomite; the dispersant mass is 5-25% clinker total quality. An INDEPENDENT CLAIM is also included for preparing soil conditioning agent comprising (i) checking: according to content of heavy metal and GB/T23349-2009 detecting potassium feldspar ore, using suitable GB/T23349-2009 limit prescribed potassium feldspar ore, (ii) grinding and granulating: using dolomite, detecting qualified potassium feldspar ore and anthracite coal respectively drying and grinding in ball mill, and sieving respectively, sieving using 0.08 mm sieve through rate more than 88%, back grinding potassium feldspar powder, dolomite powder, coal powder, mixing uniformly, humidifying to obtain 5-10 mm granule, (iii) sintering: transferring particle in vertical kiln, low temperature sintering at 1100-1300 degrees C, sintering section residence time is 30 minutes in vertical kiln, (iv) lowering sintering vertical kiln, from the kiln bottom, blowing high pressure cold air, cooling and activating to obtain clinker, and (v) modifying: smashing clinker in pulverizer, adding dispersant, full mixing, and obtaining soil conditioning agent.