The invention discloses a multi-
cloud data analysis method and
system based on a cloud platform, and relates to the technical field of
data processing. According to the method, cross-cloud security connection is configured, an acquisition agent is deployed, and heterogeneous storage is scanned to generate a structured
metadata list and a mode mapping table; constructing a unified
metadata directory based on a
semantic similarity algorithm, and labeling compliance tags and generating an interactive
topological graph in combination with geographic positioning; after a multi-
modal request is received, the blood relationship is analyzed, a standardized task descriptor is output, an optimal node is dynamically selected by adopting a four-dimensional evaluation matrix, sensitive tasks pass back an
encryption gradient through
federated learning fragmentation, and non-sensitive tasks execute
homomorphic encryption aggregation; and finally fusing an intermediate result, injecting Laplacian
noise to realize
differential privacy protection, generating a traceable audit report and automatically recycling resources. According to the method, the problem of multi-cloud
metadata splitting is solved, the task cost is reduced, and the over-budget risk is reduced; and the compliance coverage rate and the
recovery and
utilization rate are improved.