Due to the characteristics of good security, strong transmittance, and fingerprint characteristics, terahertz radiation has shown great application prospects in the fields of non-destructive detection, radar imaging, space communication, etc., which makes it unabated in current scientific research. With the characteristics of quantum anomalous Hall effect, topological protection of zero band gap, ultra-high carrier mobility, etc., the Dirac semimetals exhibit extraordinary characteristics in the field of terahertz detection, which provides a great platform for the exploration and realization of room temperature terahertz detector. In this paper, the research status of terahertz photodetectors based on the Dirac semimetal materials is introduced, and the device performance and detection mechanism are mainly discussed.