The utility model relates to a steam conduit, in particular to steam conduit heat preservation bearing structure can realize that reasonable pipeline supports the heat preservation with effective system, it includes: the support, it includes on the top surface along the support groove that steam conduit axial direction extends, supports the groove and be the arc in perpendicular to axial direction's cross -section, the lower plate, it is settled and just settles in supporting the groove with the bottom on the support top surface, is to be lighter than support groove arc curvature radius to upper shed semi -circle and semi -circular radius in the cross -section of perpendicular axial orientation, the punch holder, it is in the cross -section of perpendicular axial orientation and equals thesemi -circular radius of lower plate to the semi -circular and semi -circular radius of under shed, be the left and right insulation cover of semicircular, it sets up between the semi -circular internal surface of upper and lower splint and controls to aim at and fold in order to surround the steam conduit and to overlap in the connection zone between upper and lower splint, upper and lower splint aim at from top to bottom fold and the fastening connection in order to press from both sides tight left and right insulation cover and steam conduit between them.