Ceiling fan and surrounding device thereof

A ceiling fan, comprising:

• a main body including a main shaft, a motor connected to the main shaft, and a plurality of ceiling fan blades connected to the motor;
• a bracket set including a plurality of brackets, wherein each of the brackets has one end connected to the main shaft;
• and
• a surrounding device connected to another end of each of the brackets, wherein another end of each of the brackets is relatively far away from the main shaft, the surrounding device is roundly arranged around and spaced apart from an end of each of the ceiling fan blades, and the end of each of the ceiling fan blades is distant from the motor, and wherein the surrounding device includes at least one functional component that is configured to disinfect or sterilize air or to provide lighting;
• wherein the surrounding device further includes:
• a plurality of surrounding portions and a spoiler structure, wherein the surrounding portions are configured to assemble to each other, so as to correspondingly form the surrounding device having an annular shape and defining a closed space within, wherein the surrounding device has a top surface and a bottom surface, and a cross section of the surrounding device is getting thinner from the top surface to the bottom surface of the surrounding device, wherein the spoiler structure is formed on a side surface of each of the surrounding portions;
• wherein the at least one functional component is disposed in the closed space.