The invention provides a film peeling device and a method thereof. The peeling device for flexible film comprises an absorbing assembly. The absorbing assembly comprises a supporting component, an absorbing plate and a communication device. The absorbing plate opposes the supporting component and defines a variable volume together with the supporting component. The absorbing plate is used for adhesion of the flexible film. The communication device is used for communicating the variable volume with outside. The peeling method for the flexible film comprises absorbing the absorbing assembly on one surface of the flexible film; and afterwards, reducing volume of the variable volume for reducing a distance between the supporting component and at least partial absorbing plate.