Abstract: A W-band 12-channel direct check front end radiometer which integrates rectangular horn antenna, low noise amplifier, detector and integrated amplifier circuit is developed in this paper. The volume of the whole module is 66 mm× 67 mm× 49 mm, which has the characteristics of high integration and miniaturization. The front end of the radiometer is mostly positioned at the integral discharge by adjusting the amplifications of each channel so that the final output voltage of each channel is relatively stable and consistent, with an output voltage range of 4.11 V~4.36 V. Meanwhile, the sensitivity of each channel detector is up to 1 200 mV/ mW, radiometer temperature sensitivity of 0. 39 K in the range of 75 GHz~100 GHz. The multi-channel radiometer has the characteristics of broadband high sensitivity, high integration and low power consumption.