The present invention relates to the field of Terahertz waves, especially to a broadband and continuous Terahertz radiant source. The broadband and continuous Terahertz radiant source comprises: an excitation body; a reflection body arranged at one side of the excitation body; and a crystal arranged at one side, opposite to the reflection body, of the excitation body. The cooperation of the excitation body, the reflection body and the crystal meets the requirement that: energy is supplied to the excitation body to start the excitation body, Terahertz waves with wave lengths in a range of 30-1000[Mu] and with continuous and non-fracture waveforms are finally output from the outer surface of the crystal. The objective of the invention is to provide a Terahertz radiant source capable of generating broadband and continuous Terahertz waves with wave lengths in a range of 30-1000[Mu]. The present invention further discloses a method for generating the Terahertz waves.