A drive bracket assembly includes a back panel and a drive bracket including a first side plate and a second side plate, the first side plate forms a securing post sliding thereon, the second side plate forms two rows of restricting pieces extending towards the first side plate, one edge of the back panel is inserted into the restricting pieces and resists against the second side plate, the securing post slides on the first side plate and resists against the other edge of the back panel, the back panel is secured between the first side plate and the second side plate of the drive bracket.