Is Xiamen Maritime Bureau a local maritime bureau? What's the difference between local maritime safety administration and national maritime safety administration?

Yes, there are two kinds of establishment, direct and local:

The maritime bureau we often say refers to the maritime bureau directly under the Ministry of Communications, also known as China Maritime Bureau. It mainly governs the three rivers and four seas (Yangtze River, Pearl River and Heilongjiang; East China Sea, Yellow Sea, South China Sea, Bohai Sea). The recruitment of staff must pass the national examination.

Local maritime affairs, like transportation and road administration, belong to the subordinate units set up by the local transportation bureau, which mainly governs local waters, such as Xiangjiang River under the jurisdiction of Hunan Local Maritime Bureau. Personnel are recruited by the local government and are not within the scope of the national examination.

You can tell the difference by looking directly at the plaque. Its directly affiliated plaques are "People's Republic of China (PRC) * * and XX Maritime Bureau" and the location is "XX Local Maritime Bureau".