Objective To provide technical support for corrosion protection in the treatment of fracturing flow-back fluid of shale gas. Methods Characteristics of fracturing fluid return fluid were introduced firstly, and then corrosion protection technology was introduced in details, such as reasonable selection of materials, corrosion inhibitor technology, coating technology, cathodic protection technology and the advantages and disadvantages of all technologies. Results Non metallic materials should be used in the treatment of fracturing flow-back fluid of shale gas. Corrosion inhibitor should be as far as possible with good solubility, water dispersion and small toxicity. Coatings were often used in combination with other technologies. Cathodic protection technology has not been widely used, thus it should be promoted. Conclusion For a specific treatment of fracturing flow-back fluid of shale gas, proper protection methods should be selected based on the comprehensive assessment on corrosion environment, cost and the operation level of the field workers. In practical use, new technologies should be assessed and selected based on past experiences. New technology should be adopted as far as possible. Meanwhile several technologies should be combined so as to guarantee equipment safety.