The detection of marine environment elements include surface temperature,salinity,ice thickness,significant wave height etc.Usually,marine environment elements are detected by microwave radiometer.High resolution and sensitivity radiometer normally has wide signal bandwidth,multi-channel,hybrid system for acquisition,correlation and inversion processing with distributed and classification strategy.According to the project requirements,the design and realization of detector with multi-channel acquisition and processing unit for marine environment elements are highlighted.The test and verification are combined with radiometer system and acquisition and processing unit.The results show that the designed multi-channel acquisition and processing unit can correctly acquire and process the broadband signal at 400 MHz,assist the digital correlator to realize the interference processing,and complete the extraction of inversion imaging parameters.