The invention relates to a construction method for handling tunnel collapse by means of a reverse construction method. The construction method includes the following steps that 1, a safe shed steel protection structure is built in a collapsed hole; 2, concrete is poured on the safe shed steel protection structure in the collapsed hole; 3, consolidation grouting is conducted on a side-wall foundation of a steel-structure concrete structure; 4, the steel-structure concrete structure on the upper portion is anchored; 5, waste residues in the collapsed hole are cleared away, and supporting systems of the steel-structure concrete structure are underpinned; 6, collapse-section cavity concrete lining is formed; 7, backfilling grouting is conducted on top arches of collapse-section lining concrete. The method has the advantages that a steel-structure concrete reverse construction method is adopted, and the situation that slumping arches are instable in the collapse handling process and therefore local slumping occurs and personal and mechanical safety accidents are caused is avoided; an anchor cable or an anchor pile is adopted to lock steel-structure concrete or arch rings formed by consolidation grouting, the process is simplified, mutual interference of slag discharge, concrete cantilevering beam pouring and collapse handling promotion is avoided, and collapse handling time is shortened.