The invention discloses a medium-power power source module for a mobile wireless communication device. The medium-power power source comprises an input protective circuit 1, a flyback DC/DC converting circuit 2, a push-pull type DC/DC converting circuit 3 and a boost-buck DC/DC converting circuit 4, wherein the input protective circuit 1, the flyback DC/DC converting circuit 2, the push-pull type DC/DC converting circuit 3 and the boost-buck DC/DC converting circuit 4 are connected into a whole. The input protective circuit comprises a surge suppression circuit 11, a reverse connection protective circuit 12, an undervoltage protective circuit 13 and an overcurrent and overvoltage protective circuit 14. The flyback DC/DC converting circuit comprises a pulse width modulation and current limiting circuit 21 and a flyback transformer winding 22. The push-pull type DC/DC converting circuit comprises a pulse width modulation and current limiting circuit 31 and a push-pull type transformer winding 32. A single chip is adopted for overcurrent, overvoltage and undervoltage protection, so that the protective circuit is simple and efficient; a low drop-out linear voltage stabilizer is adopted for further voltage stabilization, so that interference with other modules is reduced, and the medium-power power source module has the advantages of being reasonable in design, stable in voltage output, good in electromagnetic compatibility, high in power source conversion efficiency and reliability, and the like.