The utility model provides an it is internal that axial steam extraction exhaust casing bearing frame cooling structure, bearing frame are located steam extraction cylinder shell, is fixed with on the bearing frame to pass the steam extraction cylinder shell body to outside supporting legs, and the part cover that the supporting legs is located steam extraction cylinder shell internal has at a distance from heat exchanger. Preferred, the space that separates between heat exchanger and the supporting legs forms cooling channel, and cooling channel's both ends feed through the extraction opening and the mechanism's intercommunication of bleeding with extraction opening outside, that lie in the internal portion of steam extraction cylinder shell respectively. This axial steam extraction exhaust casing bearing frame cooling structure, it is integrated to the supporting legs of bearing frame in with the lubricating oil pipe way, additionally do not take flow area, adopted the structural design of an advance forced convection cooling supporting legs simultaneously, adopt the bearing seal to draw gas and bleed the guide air with the oil extraction tobacco pipe and flow, force surperficial heat convection to cool off to the supporting legs, offset lubricating oil and steam extraction and heated the effect to the major part that the bearing frame brought, guaranteed the stability of shafting elevation. (B /)