The invention discloses a production technology of low-chlorine cerium carbonate. The technology comprises the following steps: 1, mixing cerium carbonate with water to form a mixed solution; 2, adding concentrated nitric acid to the mixed solution obtained in step 1, adjusting the pH value of the obtained solution to 1.5-2 by using ammonia water, heating the adjusted solution, and adjusting the pH value of the heated solution to 4-4.5 by using cerium carbonate in order to obtain an acid solution; 3, filtering the acid solution obtained in step 2 to obtain a filtrate; 4, diluting the filtrate obtained in step 3 to make the CeO2 concentration reach 70 g/L, adding an ammonium bicarbonate solution slowly first and then fast to precipitate at 55 DEG C, and allowing the obtained solution to stand after precipitation is completed in order to obtain a precipitate; and 5, washing the precipitate obtained in step 4 with water, centrifuging and dehydrating the washed precipitate, and packaging the dehydrated precipitate. The Cl<-> content of the cerium carbonate product produced through the method is smaller than 0.002%. The content of Fe, Ca, Na, K, Pb, Zn, Mn, Al, Cu, Ni, Co and Cr is smaller than 0.002%.