The utility model discloses a roadbed structure for preventing road damage in seasonally frozen ground area. When the roadbed is constructed, a layer of composite drain prevention board is laid on the full-section within the width range of the original ground of roadbed foundation soil; lower embankment soil is filled on the composite drain prevention board until reaching the maximal frozen depth level of the road; a composite drain prevention board at the maximal frozen depth is laid along the full-section of the roadbed; then upper embankment foundation soil is filled until reaching the designed embankment level; dimensional geogrids are laid on the full-section on the top surface of the roadbed; the composite drain prevention board is laid at the maximal frozen depth level of the road and the full-section of the original ground at the bottom of the embankment; the dimensional geogrids are laid on the top surface of the roadbed along the cross section direction of the roadbed; and the composite geomembrane of the foundation composite drain prevention board laid between the lower embankment filled soil and the foundation soil is upward and the water filtering geotextile is downward. The utility model has a simple structure, reduces roadbed dampness, improves integral rigidity of the roadbed, reduces road damage in seasonally frozen ground area, and has remarkable road damage prevention effect in seasonally frozen ground area and popularization perspective.