Glass fibre furnace, cover plate thereof and cover plate brick of cover plate thereof

The utility model discloses a glass fibre furnace, a cover plate thereof and a cover plate brick of cover plate thereof, wherein the cover plate brick comprises a top surface and a bottom surface opposite to the top surface; and the bottom surface is provided with a sinking part sunk to the top surface. When the cover plate brick in the utility model is spliced into the cover plate, as the cover plate brick is provided with the bottom surface which is provided with the sinking part sunk to the top surface, the cover plate brick is not softened to the glass liquid. Therefore, the cover plate ruptured and fallen with the flowing glass liquid can be avoided, the glass liquid is blocked to flow, or the significant safety accident is not caused.