A device for detecting earphone and push-botton in mobile communication terminal includes at least analog/digital sampling input end A/D-INPUT, analog power voltage VA, earphone receiver output end RECIEVER-OUTPUT, earphone receiver, microphone and microphone input end MIC_INPUT. The detecting method includes such steps as initializing A/D sampling port, TDMA frame interruption processing course as well as carrying on state setting for A/D sampling port of CPU after calling Frame being interrupted, carrying on A/D sampling at A/D-INPUI end, and carrying on analysis for A/D sampling value. |