High-entropy films are a new type of films which have been developed based on high-entropy alloys. It features many excellent properties, such as high strength and hardness with remarkable strain hardening rate, excellent wear and corrosion resistance, thermal stability, irradiation resistance, high toughness for wide-temperature range applications, etc., which traditional films are incomparable with. In recent years, high-entropy films have shown a fast development potential in various fields. This paper reviewed the recent development about high-entropy films. Preparation methods, composition design, phase structures, and various properties are mainly discussed in the paper, and the prospect of high-entropy films for high-throughput experiments is put forward. (C) 2017 Elsevier B.V. All rights reserved.