An environment risk sorting system includes a plant environment database for storing pieces of environment risk data; a risk sorting server for updating the environment risk data; a managing server coupled with the risk sorting server, wherein, the risk sorting server executes generating through a first risk evaluation module, based on the environment risk data, a first risk evaluation result for each abandoned plant, which produces an environmental site evaluation list, through which, an environmental site evaluation data of each abandoned plant and a on-spot environmental site evaluation data are obtained, updating through a second risk evaluation module succeeding environment risk data based on the environmental site evaluation data of each abandoned plant and hence generating a second risk evaluation result for each abandoned plant, which, in turn, produces an investigation list of each abandoned plant as a basis for follow-up investigation.