Promoting the low carbon emission of silicate material manufacturing is of great significance to achieve the overall strategic goal of carbon peaking and carbon neutrality. In this paper, the application of hydrogen energy on a flat glass furnace was investigated by a numerical simulation method. The effect of natural gas/hydrogen hybrid fuel on the temperature/velocity fields and the composition of flue gas was analyzed to comprehensively evaluate the feasibility of hydrogen utilization in glass furnace. The results show that the combustion of natural gas/hydrogen hybrid fuel can ensure the temperature stability of glass furnace. Compared to natural gas, the burning rate of natural gas/hydrogen hybrid fuel is improved, and the heat release of fuel combustion is more concentrated. As the proportion of hydrogen increases to 20% or above, the flame length significantly shortens, and the residence time of flue gas at glass furnace increases. In the furnace with a hydrogen proportion of 40%, the total flue gas is reduced by 4.13%, and the CO2 emission is reduced by 12.50%, while the emission NOx concentration is increased from 1 093 mg·Nm-3 (dry with 8%O2) to 1 282 mg·Nm-3 (dry with 8%O2). A further investigation on combustion system design, refractory erosion and other aspects is proposed to solve the problems of hydrogen application in large glass furnace and promote the utilization of hydrogen energy in silicate materials manufacturing.