The invention discloses a processing device applied to lithium-supporting-parent-prepared lithium carbonate. The processing device comprises a solution stirring chamber, a water guiding pipe, an air compressor, an air blower, a heater and a discharging opening. A feeding opening is formed in the left side of the solution stirring chamber, a stirring device is installed inside the solution stirring chamber, the upper end of the stirring device is connected with a rotating motor, a water injection opening is formed in the right side of the rotating motor, one end of the water guiding pipe is connected with the solution stirring chamber, the other end of the water guiding pipe is connected with a crystallizing chamber, the right end of the air compressor is connected with the water guiding pipe, the lower end of the air compressor is connected with a carbon dioxide storage tank, the air blower is installed at the upper end of an air guiding opening, the right side of the crystallizing chamber is connected with an air discharging opening, and lower end of the crystallizing chamber is connected with the discharging opening. According o the processing device applied to the lithium-supporting-parent-prepared lithium carbonate, after lithium-supporting-parent is added into water, then carbon dioxide is led, and the lithium carbonate is prepared with the recrystallization method; the operating process is simple, and the purity of the prepared lithium carbonate is high.