Clean production method of battery-grade lithium carbonate

The invention discloses a clean production method of battery-grade lithium carbonate, and relates to the technical field of lithium battery materials, in particular to the clean production method of the battery-grade lithium carbonate, which comprises the following steps: carrying out multi-stage filtration on old brine formed after salt lake intercrystalline brine is subjected to salt pan solarization evaporation to remove sodium and sylvite, and removing impurity particles; the filtered old brine is subjected to electrodialysis treatment, and magnesium-rich brine and lithium-rich brine are separated out; heating the lithium-rich brine, mixing the heated lithium-rich brine with a saturated sodium hydroxide solution for reaction, carrying out liquid-solid separation, and removing magnesium slag; evaporating and concentrating the refined filtrate to obtain a concentrated solution; mixing and reacting the concentrated solution with a sodium carbonate solution, and carrying out liquid-solid separation to obtain