Method for extracting uranium from chlorine-containing carbonate system

The invention relates to the field of wastewater treatment processes, in particular to a method for extracting uranium in a chlorine-containing carbonate system. The method comprises the following steps that an adjusting agent is added into a chlorine-containing uranium carbonate solution for adjusting, wherein the pH value of the adjusted solution is 4-8; the adjusted solution is input into ion exchange equipment, and uranium in the adjusted solution is absorbed through an ion exchange method; when the uranium concentration of tail liquid reaches the penetration concentration or a resin tower for adsorption is saturated, the resin tower loaded with saturation is switched into leaching transformation operation, and liquid in the tower is emptied; the loaded saturated resin tower is leached by using a leaching agent or a leaching barren solution; the liquid is discharged from the leached resin tower, a transformation agent is added into lower inlet liquid, the resin is transformed, and the transformed resin to