The invention discloses an interference detecting and processing system and method. And the system comprises A/D converter, frequency converting unit, and extracting and filtering unit and also comprising collecting module and analyzing module, where the collecting module is used to collect the base band signal extracted and filtered by the extracting and filtering unit, make short-time energy integration on the base band signal and input the integration result into the analyzing module; the analyzing module is used to form a receiving power-time relation sequence and detect and judge whetherinterference exist. And it implements detection and elimination for time-sharing interference, obtaining accurate system load, reducing system mis-triggering caused by increase of total bandwidth power and assuring power control astringency.