A transparent terahertz absorber based on permittivity-gradient elastomer-encapsulated-organohydrogel (PDA@OHG) is presented. This material exhibits high absorption (average reflection loss of 49.03 dB) in the 0.5–4.5 THz band with a thin thickness of 700 μm and high visible transmittance of 85.51%. The absorption mechanism is primarily due to ionic conduction loss in the polar liquid within the organohydrogel. The hydrophobic and adhesive elastomer coating enhances the absorber's stability and interfacial adhesion. The PDA@OHG outperforms existing THz absorbers in terms of reflection loss and thickness. The material's high visible transmittance is attributed to its low extinction coefficient and close refractive index between components. The THz absorbing mechanism is dominated by ionic conduction loss, not electronic conduction loss. The PDA@OHG shows improved resistance to drying and maintains high THz absorption stability. It also demonstrates strong adhesion to various substrates. This work provides a viable approach for designing transparent THz absorbers with potential applications in terahertz technologies.A transparent terahertz absorber based on permittivity-gradient elastomer-encapsulated-organohydrogel (PDA@OHG) is presented. This material exhibits high absorption (average reflection loss of 49.03 dB) in the 0.5–4.5 THz band with a thin thickness of 700 μm and high visible transmittance of 85.51%. The absorption mechanism is primarily due to ionic conduction loss in the polar liquid within the organohydrogel. The hydrophobic and adhesive elastomer coating enhances the absorber's stability and interfacial adhesion. The PDA@OHG outperforms existing THz absorbers in terms of reflection loss and thickness. The material's high visible transmittance is attributed to its low extinction coefficient and close refractive index between components. The THz absorbing mechanism is dominated by ionic conduction loss, not electronic conduction loss. The PDA@OHG shows improved resistance to drying and maintains high THz absorption stability. It also demonstrates strong adhesion to various substrates. This work provides a viable approach for designing transparent THz absorbers with potential applications in terahertz technologies.