Microwave technology for brain information detection, which is gradually becoming mature, has been applied to the entity detection and operation. Through the combination of ultrasonic and nuclear magnetic methods, the microwave information detection system has been improved and the efficiency of information detection has also been enhanced. Three kinds of microwave technologies of brain deep information detection and the existing problems are concluded in this paper. It is found that the microwave technology has great potential in brain detection through the analysis on three different microwave detection applications. These applications can effectively provide solutions for pathological examination of brain tissue or other human tissue. By combining with artificial intelligence, microwave technology can also be applied in remote monitoring of the brain or other parts of the body.