The invention discloses a device for preparing liquid sulfur dioxide from high-temperature sulfur-containing waste gas. The device comprises a filter (1), a reboiler (2), a phase-change condenser (3), an absorption tower (4), a lean / rich liquor heat exchanger (7), a desorption tower (8), a dryer (9), a gasification condenser (10), a compressor (11) and a liquid sulfur dioxide storage tank (12). The device has the advantage that high-temperature properties of the sulfur-containing waste gas are sufficiently utilized, and material flow connection sequences are adjusted, so that the purpose of optimally configuring energy can be achieved; abundant water vapor in the waste gas is preliminarily removed, 'primary thickening' and 'secondary absorbing' modes are adopted for sulfur dioxide, accordingly, the sizes of equipment can be effectively reduced, the mass transfer efficiency can be improved, and the purposes of saving energy and reducing consumption can be achieved; public resources and existing technologies are sufficiently utilized, so that the comprehensive efficiency of systems can be improved.