The utility model discloses a fixed bed gas making stove bottom double gear fixes a position thrust device, including installing the fire bars machine in fixed bed gas making stove stove bottom one side, it is rotatory that the fire bars machine drives the ash pan through drive gear drive bull gear, and fixed bed gas making stove stove bottom offside is equipped with gear positioner, and gear positioner includes integrative moulding by casting's gear location case, and gear location incasement is equipped with driven location gear, and gear location case is equipped with the breach with fixed bed gas making stove bottom bull gear opposite side, and driven location gear is at the bull gear intermeshing of breach department and fixed bed gas making stove bottom, gear location case below is equipped with the bearing box of relative installation with it, installs the bearing in the bearing box, and the bearing is connected through the pivot with the driven location gear of top. The utility model discloses a fire bars machine gear drive gas making stove bottom ash pan and engaging teeth wheel positioner have increased ash pan life, have reduced maintenance duration and number of times and have stablized the effective of equipment, have also ensured the long period steady operation of apparatus for producing.