The invention discloses a float glass melting furnace, which comprises a melting part, a neck, a working part, at least two material supply passages and forming devices with quantity being identical to that of the material supply passages, wherein one end of each material supply passage is communicated with the working part, and the other end of each material supply passage is respectively communicated with one forming device. More than two material supply passages are communicated with the working part, so that a production way of the float glass with multiple lines and one furnace is realized, the construction cost of the float glass melting furnace is effectively reduced, the production efficiency of the float glass is improved, and the production cost of the float glass is reduced; and since more than two material supply passages can effectively guarantee the stability of the melting process, the material supply passages can effectively guarantee the stability of the product quality, and the product quality can be improved.