Method for identifying lyocell A100 and application of method

The invention relates to a method for identifying lyocell A100 in regenerated cellulose fiber. The method comprises the following steps: dissolving a sample containing lyocell A100 in a formic acid/zinc chloride solution, observing an insoluble substance after the dissolution reaction, and qualitatively detecting whether the sample contains lyocell A100. The invention further provides application of the method in detection of lyocell A100. The method can be used for quickly and accurately identifying lyocell A100 in other regenerated cellulose fiber, is a qualitative identification method with high feasibility and meanwhile lays a foundation for quantitative analysis of lyocell A100.