The present invention discloses a fourth generation mobile communication and impulse radio ultra-wideband integrated reconfigurable system, belongs to wireless communication dual-mode reconfigurable system integration field. The system includes transmitter and a receiver, the transmitter selects direct upconversion fourth generation mobile communication (4G) radiofrequency signal or impulse radioultra-wideband (IR-UWB) communication signals, and amplifying by a reconfigurable power amplifier then transmitting to space by a intelligent antenna; the receiver receives signal from the intelligentantenna and then input into a reconfigurable low noise amplifier, proceeding down-conversion and analog-to-digital conversion to the 4G mobile communication signal or high speed sampling the IR-UWB signal, and then inputting into baseband for signal processing so as to implement reconfigurable integration of two communication systems. The invention provided 4G system is a wide-band communicationsystem of direct frequency conversion structure, the IR-UWB no longer has traditional intermediate frequency and radio frequency concepts, there is no modulation/demodulation needed in communication process so as to make the system compatible with two communication standard.