The invention relates to the field of signal processing, and discloses a multiphase random subsampling analog information converter which is composed of a multiphase frequency division phase shifter, a pseudorandom number generator, a low-speed ADC, an accumulator and a parallel-series conversion circuit. The invention also provides a multiphase random subsampling analog method. The beneficial effects of the multiphase random subsampling analog information converter are that compressed sensing of signals is realized by the analog information converter by using subsampling and multipath ADC alternate random sampling and accumulation. According to the multiphase random subsampling analog information converter, the problem of low sampling precision caused by the high-speed random ADC in an RS sachem can be solved, and the influence of jittering and aperture effect generated by a frequency mixing circuit in RD and MWC schemes on signal compression sampling can also be avoided so that the compression and reconstruction performance of the signals can be greatly improved.