A mounting bracket includes a first side plate, a second side plate, a top plate, a bottom plate, a pair of dividing plates, and a pair of metal plates. The top plate is connecting top edges of the first side plate and the second side plate. The bottom plate connecting bottom edges of the first side plate and the second side plate. The dividing plates are located between the top plate and the bottom plate and parallel to the first side plate and the second side plate. The metal plates are mounted on the first side plate and the second side plate respectively. The mounting bracket further includes a first accommodating space defined between the first side plate and one of the dividing plates, and a second accommodating space defined between the second side plate and the other one of the dividing plates.