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The Taishan Antineutrino Observatory (TAO or JUNO-TAO) is a satellite experiment of Jiangmen Underground Neutrino Observatory (JUNO) and located near the Taishan nuclear power plant (NPP). TAO will measure the energy spectrum of reactor antineutrinos with unprecedented precision, which will benefit both reactor neutrino physics and the nuclear database. A detector geometry and event visualization system has been developed for TAO. The software is based on ROOT packages and embedded in the TAO offline software framework. It provides an intuitive tool to visualize the detector geometry, tune the reconstruction algorithm, understand the neutrino physics, and monitor the operation of reactors at NPP. The further applications of the visualization system in the experimental operation of TAO and its future development are also discussed.