The utility model relates to an anti-collision barrier for a highway bridge and particularly relates to a transformation structure for a concrete barrier of the highway bridge. The transformation structure is provided with a wall body in a certain length along the longitudinal extension direction of a bridge surface and comprises an original combination type barrier lower portion reinforced concrete wall body; the upper portion of the original combination type barrier lower portion reinforced concrete wall body is provided with a newly added concrete barrier wall body; newly added reinforcing bars are arranged inside the newly added concrete barrier wall body; the newly added reinforcing bars are connected with reinforcing bars which are arranged inside the original combination type barrier lower portion reinforced concrete wall body. The transformation structure has the advantages of transforming an existing combined barrier into a concrete barrier structure, fully using materials for an original barrier lower portion wall body structure, saving transformation construction costs, improving barrier anti-collision levels and satisfying the existing traffic requirements.