Read block info from log
when I looking to a debug.log I don't see anything about blocks. Is it possible?

I expect the net category of log information should contain entries relating to the exchange of blocks with peers but I would not expect the full block data to be logged.
The name of the debug log suggests it is mainly intended as a way to investigate problems, and not intended as a means to routinely extract block data. You should use the RPC API for that.

Related

What are the debug categories?
API reference (JSON-RPC)
getblock