A molten tin bath containing molten tin is used for float glass production. The molten tin bath comprises a wide section, a narrow section and a contraction section which connects the wide section with the narrow section, wherein the wide section comprises a glass forming section, and the molten tin depth range of the glass forming section is between 28mm and 48mm. The molten tin bath containing molten tin is used for float glass production. The molten tin bath comprises the wide section, the narrow section and the contraction section which connects the wide section with the narrow section, wherein the wide section comprises the glass forming section, and the molten tin depth range of the glass forming section is between 36mm and 40mm, and the molten tin depth range of the contraction section is between 87mm and 91mm. The design of the molten tin depth of the glass forming section overcomes the conventional design bias, a shallower molten tin depth is adopted, and the buoyancy which is generated by the molten tin depth completely satisfies float glass production requirements and can not generate adverse impact on the float glass production.