The invention discloses a fly wadding preventing device for an air intake system of a gas turbine. The fly wadding preventing device is mainly composed of a steel wire gauze bin, a steel wire gauze, an air intake frame, a steel wire gauze recycling bin and a fly wadding collecting device; the steel wire gauze bin and the steel wire gauze recycling bin are separately arranged at the upper part andthe lower part of the air intake frame and are both fixedly connected with the air intake frame; one end of the steel wire gauze is intertwined on a roller of the steel wire gauze bin; the other end of the steel wire gauze is intertwined on the roller of the steel wire gauze recycling bin; and the fly wadding collecting device is connected with the air intake frame through a fly wadding sucking pipeline. According to the fly wadding preventing device disclosed by the invention, an intake air filter system of the gas turbine is mainly used for filtering tiny particles so as to play an effect ofprotecting passage components of the gas turbine; the steel wire gauze is used for intercepting fly wadding, and reversely flowing and collecting the fly wadding on the surface of the steel wire gauze after the amount of the intercepted fly wadding reaches a certain value, and thus the fly wadding preventing device can realize the aim of ceaseless and continuous use.