Terahertz Schottky diode is a very important device in terahertz application, which can be used to mix or multiply high frequency signals. The development of terahertz Schottky diode shows an important significance for the terahertz technology. The species and characteristics of terahertz Schottky diodes are introduced. The research results and progress in research institutions at home and abroad are described from the terahertz Schottky diode aspects. The key technologies and development trends of terahertz Schottky diode are summariz