To solve the problem of excessive fluorine dust concentration of the rare earth electrolytic furnace, proposes a management scheme of convergent air curtain dust removal system. Through experiments, studies the relationship between the installing angle of convergent air curtain device and the convergence degree and the relationship of the fan air volume and the air curtain convergence degree, gets optimum technological parameters for convergent air curtain device, and provides the basis for production design. By means of analysis and experimental condition simulation on the airflow field of the convergent air curtain dust removal system, obtains the airflow characteristics of the system, thus further verifies the feasibility of the isolation control of polluted airs for the convergent air curtain.