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keelng KeePass supports the Advanced Encryption Standard (AES, Rijndael) and the Twofish algorithm to encrypt its password databases. Both of these ciphers are regarded as being very secure. AES e.g. became effective as a U.S. Federal government standard and is approved by the National Security Agency (NSA) for top secret information.
The complete database is encrypted, not only the password fields. So, your user names, notes, etc. are encrypted, too.
SHA-256 is used to hash the master key components. SHA-256 is a 256-bit cryptographically secure one-way hash function. No attacks are known yet against SHA-256. The output is transformed using a key derivation function.
Protection against dictionary and guessing attacks: by transforming the master key component hash using a key derivation function (AES-KDF, Argon2, ...), dictionary and guessing attacks can be made harder.
Process memory protection: your passwords are encrypted while KeePass is running, so even when the operating system dumps the KeePass process to disk, your passwords aren't revealed.
[2.x] Protected in-memory streams: when loading the inner XML format, passwords are encrypted using a session key.
Security-enhanced password edit controls: KeePass is the first password manager that features security-enhanced password edit controls. None of the available password edit control spies work against these controls. The passwords entered in those controls aren't even visible in the process memory of KeePass.
The master key dialog can be shown on a secure desktop, on which almost no keylogger works. Auto-Type can be protected against keyloggers, too.
See also the security information page.
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https://keepass.info/features.html银行的加密算法不只 aes，用也会在开发。
一般你用目前主流的加密算法或保密手段，一般够用了。