Herein, terahertz spectra of four kinds of commonly used three-dimensional (3D) printing materials are detected and analyzed. Experiments show that these printing materials have obvious differences in the range of 0.20-2.60 THz. The transmittance of 3D printing polycarbonate measured in terahertz is highest. The refractive index of the four materials ranges from 1.45 to 1.65, and the refractive index of the photosensitive resin is the highest, which is approximately 1.62. The real and imaginary parts of the dielectric constant of these materials range from 2.20 to 2.75 and from 0.05 to 0.35, respectively. From the viewpoint of the absorption spectra, there are no absorption peaks among the four materials. This study lays the foundation for the selection of materials for 3D printed terahertz devices.