The utility model relates to a gas turbine technical field discloses a gas turbine turbine cooling gas circuit, and it includes middle pivot, fires pressure jar and turbine disc, middle pivot and the clearance of firing between the pressure jar form quiet set of chamber of commentaries on classics, the turbine disc with the rear end fixed connection of middle pivot, the circumference of middle pivot be equipped with a plurality of with change the radial hole that quiet set of chamber is linked together, be equipped with the circulation cavity in the middle pivot, the circumference of turbine disc be equipped with a plurality of with the axial hole that the circulation cavity is linked together, the axial hole accesss to the turbine movable vane. The utility model discloses can purify the air in the pivot in the middle of getting into, avoid blockking up the turbine movable vane, the turbine sprue will be poured into including the air of impurity into simultaneously, to the turbine acting, the loss of power sum efficiency will be avoided.