Terahertz Radio Frequency(RF) devices and communication systems typically exhibit operating bandwidths ranging from several GHz to tens of GHz, with substantial variations in operating characteristics across the band, presenting numerous challenges for performance testing. To address this, this paper proposes an automated measurement method for the terahertz band and designs a versatile automated test system capable of meeting diverse testing requirements, including terahertz RF device and link testing, signal processing algorithm testing, long-distance terahertz channel measurement, and terahertz antenna far-field testing. Measurement results demonstrate that the system can efficiently and accurately complete these various terahertz band testing tasks, not only improving testing efficiency but also providing reliable data support for related research and applications.