Method for recovering rare earth from low-concentration rare earth waste liquid

The invention relates to a method for recovering rare earth from low-concentration rare earth waste liquid, which comprises the following steps: a) contacting the low-concentration rare earth waste liquid with amino phosphonic acid resin, and carrying out resin adsorption reaction to respectively obtain rare earth-rich resin and post-adsorption liquid; b) contacting the rare earth-rich resin obtained in the step a) with a low-titanium solution, and carrying out a first-stage desorption reaction to respectively obtain a rare earth-rich solution and a first-stage desorption resin; c) contacting the first-stage desorption resin obtained in the step b) with a high-titanium solution, and performing a second-stage desorption reaction to respectively obtain a second-stage desorption solution and titanium-rich resin; d) contacting the titanium-rich resin obtained in the step c) with a hydrogen peroxide and hydrochloric acid mixed solution, and carrying out a resin regeneration reaction to respectively obtain regenera