This study presents a transparent terahertz (THz) absorber based on a permittivity-gradient elastomer-encapsulated organohydrogel (PDA@OHG). The PDA@OHG is composed of a high-permittivity polyacrylamide (PAM) organohydrogel core, a low-permittivity polydodecyl acrylate (PDA) elastomer coating, and a PDA/OHG mixture at the interface. This design allows for high THz 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 (85.51%). The THz absorbing mechanism primarily involves ionic conduction loss from the polar liquid in the organohydrogel. The hydrophobic and adhesive PDA coating enhances the absorber's stability and adhesion properties. This work opens new avenues for designing transparent THz absorbers, which could advance applications in 6G communication, security screening, and biological sensing.This study presents a transparent terahertz (THz) absorber based on a permittivity-gradient elastomer-encapsulated organohydrogel (PDA@OHG). The PDA@OHG is composed of a high-permittivity polyacrylamide (PAM) organohydrogel core, a low-permittivity polydodecyl acrylate (PDA) elastomer coating, and a PDA/OHG mixture at the interface. This design allows for high THz 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 (85.51%). The THz absorbing mechanism primarily involves ionic conduction loss from the polar liquid in the organohydrogel. The hydrophobic and adhesive PDA coating enhances the absorber's stability and adhesion properties. This work opens new avenues for designing transparent THz absorbers, which could advance applications in 6G communication, security screening, and biological sensing.