The radar level meter has a long detection distance and low beam energy, and can be installed in various metal and non-metal containers or pipelines. It is suitable for occasions where dust, water mist, inert gas and steam exist. The radar level meter has no harm to the human body and the environment, and has the advantages of not being affected by the specific gravity of the medium, not being affected by the change of the dielectric constant, and not requiring on-site calibration.