During　the　use　of　radiometer,　antenna　calibration　is　an　indispensable　step.　In　this　paper,　the　calibration　source　is　designed　for　human　body　temperature　measurement　calibration.　So,　the　calibration　source　should　have　the　close　to　1　emissivity　in　12-18GHz　and　have　good　temperature　uniformity.　To　achieve　the　above　two　requirements,　a　small　and　high-precision　and　temperature　controllable　blackbody　calibration　device　is　designed.　In　this　paper,　the　electromagnetic　scattering　characteristics　and　temperature　distribution　uniformity　of　blackbody　calibration　source　is　analyzed.　The　cone　model　design　is　determined　by　simulation.　During　the　simulation,　it　is　found　that　increasing　the　coating　thickness　does　not　significantly　improve　the　emissivity　under　small-scale　and　large　elevation.　Finally,　a　calibration　source　is　realized.　Under　the　working　frequency　band,　the　emissivity　is　higher　than　0.998.　And　the　maximum　surface　temperature　distribution　error　is　only　2　^circC　in　100　^circC　situations.　©　2022　IEEE.