Solution mining method for quaternary African underground potassium ore

The invention discloses a solution mining method for a quaternary African underground potassium ore. The solution mining method includes: S1, building a liquid injection well and liquid extracting wells respectively in a rock core and head and tail ends of the quaternary African underground potassium ore; S2, adopting normal-temperature water as a solution mining agent, and injecting the solutionmining agent into a rock core layer through the liquid injection well, so that the solution mining agent can flow through the rock core to form a solution cavity and mine inorganic salt in the rock core to form solution mining liquid; S3, extracting the solution mining liquid from the liquid extracting wells, injecting the extracted solution miming liquid into the rock core layer again, repeatingthe S3, stopping circulating the solution mining liquid till mass percent of K+ in the solution mining liquid, monitored at openings of the liquid extracting wells, reaches to 4%-4.5%, and extractingall the solution mining liq