Track beam suitable for wide-body straddle type monorail train without stable wheels

A track beam suitable for a wide-body straddle type monorail train without stable wheels comprises an outer wrapping steel plate which is of an open structure defined by steel plates except the top face, is provided with an inner cavity, has an n-shaped cross section and further comprises an n-shaped cross section top face support, an n-shaped cross section first branch and an n-shaped cross section second branch. The shear key is arranged on the inner wall of the outer wrapping steel plate; a concrete structure is embedded, and the steel-encased plate serves as a formwork and is poured to the top face of the top face support with the n-shaped section; the stiffening ribs are provided with holes and are arranged in n-shaped spaces formed by the n-shaped cross section top surface support, the n-shaped cross section first branch and the n-shaped cross section second branch at intervals in the longitudinal direction; and the asphalt concrete pavement layer is arranged on the n-shaped section top surface support.