The invention discloses a high temperature resistant filler for manufacturing a cast steel cooling wall for a blast furnace and belongs to the technical field of blast furnace cooling walls.The high temperature resistant filler is prepared from, by mass, 80-83 parts of chromite sand, 9-13 parts of aluminum powder, 5-6 parts of graphite powder, 3-4 parts of perlite powder, 2-3 parts of lime powder, 6-9 parts of blast furnace gas ash, 2-3 parts of rutile type titanium dioxide and 7-10 parts of calcium-free chromium slag.The high temperature resistant filler makes a cooling water pipe and a cast steel cooling wall body seamlessly fused together, the pipe wall of the cooling water pipe is not molten through under the condition that a high-temperature steel ladle is fused off, and the seamless effect of 'fusion while no melting ' is successively achieved, so that the ball passing rate of the cooling water pipe of the cast steel cooling wall is up to 100%, and the pass percent of a water pressure test of the cooling water pipe is up to 100%.