The invention discloses a construction method for anti-radon engineering. The method comprises the following steps that an anchor bolt is arranged on a cavity wall or a wall surface, or a metal framework is firstly arranged on the cavity wall or the wall surface, then an anchor bolt is arranged on the metal framework, a buckle bracket is arranged on the anchor bolt, then the buckle bracket is fixed on the anchor bolt with a nut, and coated plates are fixed on the buckle bracket in a clamping connection mode; and the coated plates are sealed by using adhesive bonding. The construction method for anti-radon engineering has the advantages that the independent installation cannot be affected by rough cavity wall or wall, many attached sundries, humidity and the like, the construction procedurelinks such as leveling, polishing, dedusting and the like for the cavity wall or wall are simplified, the pollution to the environment by the procedures is avoided, the construction efficiency is improved, the labor hours are reduced, the energy consumption is reduced, the engineering quality is improved, when the wall is cracked caused by external force, the independent buckle connection on thecavity wall or outside the wall can only have an impact on fixing the buckle and cannot affect an external anti-radon protective layer.