The embodiments of the present disclosure provide a power sharing method and a base station, wherein the method comprises: according to a power demand of the communication systems of at least one mode among communication systems of different modes sharing a power amplifier, determining whether to perform power sharing among communication systems of different modes; if it is determined to perform power sharing among communication systems of different modes, adjusting an available power of communication systems of one or more modes therein. According to the embodiments of the present disclosure, when it is determined to perform the power sharing according to the power demands, power sharing is performed among communication systems of different modes, thereby realizing dynamic and flexible power sharing among communication systems of at least two modes.