Fan assembly of notebook computer, notebook computer bottom shell and notebook computer

The fan assembly is suitable for being installed outside the bottom shell of the notebook computer, the bottom shell is provided with an installation opening matched with the fan assembly in shape, and the fan assembly is characterized by comprising an upper cover, a lower cover and a fan assembly, the shape of the lower cover is matched with that of the mounting opening so as to seal the mounting opening; the side wall is provided with an air outlet, and the side wall, the upper cover and the lower cover form a containing space which is used for containing the fanning assembly and forming a fan flow channel. According to the technical scheme, the installation opening matched with the fan assembly in shape is formed in the bottom shell of the notebook computer, the fan assembly is installed in the notebook computer through the installation opening in the bottom shell, the heat dissipation performance is improved, and meanwhile disassembly and cleaning are convenient.