The invention discloses a sheet glass float process with one melting furnace and multiple molding production lines. The process comprises raw material mixing, melting in a melting part of a melting furnace, cooling in a cooling part of a melting furnace, tin groove molding, annealing in an annealing furnace as well as sheet cutting and taking at a cold end, and is characterized in that: a multi-pass molten glass pathway structure which is provided with a liquid inlet and more than two liquid outlets is adopted for the cooling part of the melting furnace; and each liquid outlet is connected with a tin groove molding part, an annealing part in the annealing furnace and a sheet cutting and taking part at the cold end to form the multiple molding production lines. According to the invention, the multi-pass molten glass pathway structure is adopted, so that the sheet glass float process with one melting furnace and multiple molding production lines is realized; cooling of the molten glass is adjusted and controlled by adopting the heat radiating amount of a molten glass pathway, the melting capability of the melting furnace can be always kept in a complete saturation working state through the linkage adjustment of the multiple molding production lines, the problem of waste of the melting capability of the melting furnace is well solved, and glass of different thicknesses can be produced simultaneously; and the multiple molding production lines of different scales are adopted, so that the melting capability of the melting furnace is easier to bright into full play.