The importance of studying the hydrodynamics of the glass-melting tank is substantiated. The main equations of a numerical model of the tank hydrodynamics are given. The calculation results of temperature fields and streamlines are given for a glass-melting furnace with an output of 300 tons per day. The adequacy of the calculation results as applied to real furnace operating conditions is demonstrated. The developed model of hydrodynamics of the melting tank can be used in solving applied problems of designing glass-melting furnaces.