Does Postal Bank have a deposit insurance logo?

Yes. According to the official website of China Post, in accordance with the unified deployment of the People's Bank of China, all business outlets under the jurisdiction of the Postal Savings Bank of China are required to post deposit insurance signs at prescribed locations. So Japan Post Bank has a deposit insurance logo. Deposit insurance means deposit protection. It is a form of legislation passed by the state to provide clear legal protection for the public's deposits.