Leaching method of weathered crust illuviation type ion rare earth ore

The invention provides a leaching method of weathered crust illuviation type ion rare earth ore and relates to improvement of a wet metallurgical rare earth leaching process. The leaching process of the leaching method comprises adding a leaching agent for leaching. The leaching method is characterized in that fulvic acid is further added in the leaching process of the leaching method as a leaching aid. The leaching method of weathered crust illuviation type ion rare earth ore provided by the invention obviously prompts the column leaching effect of rare earth while reducing the dosage of ammonium sulfate, reduces the dosage of the leaching agent ammonium sulfate while improving the rare earth leaching rate, and also effectively reduces the rare earth extraction cost and generation of ammonia-nitrogen wastewater.