The cage assembly 1 includes a cage body 10 and a baffle 20. The cage body 10 includes a rear portion 11, a first plate portion 12, a second plate portion 13, a third plate portion 14, a fourth plate portion 15, and a tab 16. The first plate portion 12, the second plate portion 13, and the third plate portion 14 are respectively connected to different sides of the rear portion 11. The first plate portion 12 and the second plate portion 13 are respectively located at two opposite sides of the rear portion 11, and the third plate portion 14 is located between and connected to the first plate portion 12 and the second plate portion 13. The fourth plate portion 15 is located between and connected to the first plate portion 12 and the second plate portion 13. The fourth plate portion 15 is located close to the third plate portion 14 and located above the rear portion 11. The tab 16 protrudes from the third plate portion 14. The tab 16 is located between the fourth plate portion 15 and the rear portion 11 and is located close to where the third plate portion 14 connects with the first plate portion 12.