The horn-mouth radar level gauge is a new type of level gauge that uses the application of radar technology to successfully realize the function of level surveying, and it is a non-contact level gauge. It can be used to survey various liquid media, and will not be affected by physical factors such as the density of the liquid media itself, liquid concentration, temperature and other physical factors. It can be used for surveys of non-volatile corrosive media. It has the advantages of low maintenance, high performance, high precision, high reliability and long service life. Compared with capacitive, heavy hammer and other contact instruments, it has incomparable superiority. The transmission of microwave signals is not affected by the atmosphere, so it can meet the requirements of harsh environments such as volatile gases, high temperature, high pressure, steam, vacuum and high dust during the process.