The invention relates to an oblique hanging wall of a flat glass melting furnace. The oblique hanging wall comprises upright columns (1) which are arranged at two sides of a feed port of the melting furnace respectively, wherein a hanger (2) is arranged on each upright column. The oblique hanging wall is characterized in that the corresponding hangers are connected with each other through a group of cross beams (2a), a row of fireproof material bricks (4) are arranged below each cross beam, and the fireproof material bricks of adjacent cross beams are in step-shaped step-by-step distribution. The oblique hanging wall disclosed by the invention has the beneficial effects of simple structure and high safety and reliability, the fireproof material bricks of the hanging wall are independent of one another, and when any fireproof material brick is damaged, the damaged brick can be dismounted and replaced conveniently.