Abstract: a high-power uplink and downlink switching device and a communication apparatus are disclosed. A radio frequency switch and a synchronization control module of the device cooperate. A circulator has a first port connected to an output end of a power amplification module, a second port connected to a second radio frequency port, and a third port connected to a low-noise amplifier module via a first radio frequency switch. The third port is further connected to a high-power load resistor and a second radio frequency switch via a first microstrip line, so as to be separately grounded. A radio frequency impedance from a first end to a second end of the first microstrip line is in a high-impedance state.