The invention provides a multi-
modal data desensitization method,
system and device and a medium, and belongs to the technical field of
information security. The method comprises the following steps: firstly, acquiring multi-
modal original data based on preset access information and acquisition frequency, and after standardized preprocessing, positioning sensitive information by using a classification
recognition algorithm and generating an analysis report. Then, according to a report, matching a strategy from a desensitization strategy
library bound with the sensitivity level, adjusting a dynamic
confusion algorithm parameter to desensitize, integrating and generating desensitized multi-
modal data, and recording and storing a mapping relationship between the
original data and the desensitized data; and if a restoration request is received, after
authorization verification is passed, reverse desensitization restoration data is carried out by using the mapping relation. Besides, full-process feedback information is collected, the desensitization effect is quantitatively evaluated according to a preset index, the desensitization strategy and
algorithm are iteratively optimized accordingly, and effective desensitization and safety management of multi-
modal data are achieved.