Gain adjustment module, signal amplification circuit, active duplexer and communication equipment

The utility model is applicable to the technical field of communication, and provides a gain adjustment module, a signal amplification circuit, an active duplexer and communication equipment, the gain adjustment module comprises a first attenuator with adjustable power attenuation, and a power pin of the first attenuator is used for accessing a first power signal. A controlled pin of the first attenuator is used for accessing a second power supply signal or a control signal; the gain adjusting module further comprises a first one-way conductive unit, the input end of the first one-way conductive unit is used for accessing a first power supply signal, and the output end of the first one-way conductive unit is connected with the power supply pin; and the input end of the second one-way conductive unit is used for accessing a second power supply signal or a control signal, and the output end of the second one-way conductive unit is connected with the controlled pin, so that the use scene of the gain adjustment m