The invention relates to a fuel cell stack sensitivity test data slicing method. During a sensitivity test, multiple load currents are applied, the sensitive variables under respective load currents change stepwise, and transition interference data exists in the transition process of the load currents. The method is configured to slice off the test data corresponding to a certain reference sensitive variable value during the step change of the sensitive variable under a certain set reference load current value, and comprises the following steps of (1) searching the data generated by the entiretest process, slicing off all data, with sensitive variables having the reference sensitive variable value, under the reference load current value to form coarse slice data; (2) eliminating the transition interference data to obtain the start time and the end time of the data to be sliced by using a TOA method; (3) slicing off the data between the start time and the end time from the coarse slicedata to obtain accurate slice data. Compared with the prior art, the method has high slicing efficiency and accurate and reliable results.