Abstract: A pre-distortion processing device, a signal transmission system, and a pre-distortion processing method are provided. The pre-distortion processing device comprises a pre-distortion unit, a transmission unit and a coupling unit which are sequentially connected. A feedback path of the coupling unit is connected to the pre-distortion unit. The pre-distortion processing device further comprises a generation unit and a combiner unit. The generation unit is used to generate a non-hopping wideband signal having a bandwidth greater than a bandwidth of a system input signal. A first input terminal of the combiner unit is connected to an output terminal of the generation unit. A second input terminal of the combiner unit is used to receive the system input signal. An output terminal of the combiner unit is connected to an input terminal of the pre-distortion unit.