OTA upgrading method and system

The invention relates to an OTA upgrading method and system which are applied to an automobile electronic product, and the method comprises the steps: S1, continuously downloading a current data block of a current vehicle upgrading package; s2, storing the current data block in a cache region of a current vehicle memory, and sequentially performing integrity verification, decryption signature verification and upgrading on the current data block; and S3, judging whether the current data block is the last data block, if so, reporting an upgrading result to the server, and if not, continuing to execute the steps S1, S2 and S3. Compared with the prior art, the method has the advantages that the upgrading data is divided into the small data blocks, cache downloading, decryption, signature verification and the like can be operated in a memory, IO operation in the stages is avoided, performance consumption of a system is reduced, the phenomena of slow system response, jamming and the like are avoided, and user exper