Disclosed in the embodiments of the present application are a communication chip, a communication module, a communication system and a base station. The communication chip specifically comprises a frequency mixer, a power division module and a switch module, wherein the frequency mixer is connected to a first interface, and is used for performing frequency conversion processing on a first input signal received by the first interface or a first output signal needing to be sent by the first interface; the power division module is connected to a second interface, and is used for performing combining processing on a second input signal received by the second interface or performing power division processing on a second output signal needing to be sent by the second interface; the switch module is connected to a third interface, the third interface is used for receiving a third input signal or sending a third output signal, and the switch module is used for controlling the second interface to communicate with the third interface by means of the power division module, or communicate with the first interface by means of the power division module and the frequency mixer, such that the communication chip can serve as a driving chip or a frequency mixing chip to be used in series at the same time, thereby realizing low cost and reducing the loss of a power divider.