In　this　paper,　a　multiband　noncontact　temperature-measuring　microwave　radiometer　system　is　developed.　The　system　can　passively　receive　the　microwave　signal　of　the　core　temperature　field　of　the　human　body　without　removing　the　clothes　of　the　measured　person.　In　order　to　accurately　measure　the　actual　temperature　of　multilayer　tissue　in　human　core　temperature　field,　four　frequency　bands　of　4-6　GHz,　8-12　GHz,　12-16　GHz,　and　14-18　GHz　were　selected　for　multifrequency　design　according　to　the　internal　tissue　depth　model　of　human　body　and　the　relationship　between　skin　depth　and　electromagnetic　frequency.　Used　to　measure　the　actual　temperature　of　human　epidermis,　dermis,　and　subcutaneous　tissue,　a　small　and　highly　directional　multiband　angular　horn　antenna　was　designed　for　the　radiometer　front　end.　After　the　error　analysis　of　the　full-power　microwave　radiometer,　a　novel　hardware　architecture　of　the　microwave　interferometric　temperature-measuring　radiometer　is　proposed,　and　it　is　proven　that　the　novel　interferometric　microwave　radiometer　has　less　error　uncertainty　through　theoretical　deduction.　The　experimental　results　show　that　the　maximum　detection　sensitivity　of　the　novel　interferometric　microwave　temperature-measuring　radiometer　is　215　mV/dBm,　and　the　temperature　sensitivity　is　0.047　K/mV.　Compared　with　the　scheme　of　the　full-power　radiometer,　the　detection　sensitivity　is　increased　7.45-fold,　and　the　temperature　sensitivity　is　increased　13.89-fold.