A server device with a storage array module is provided. The server device includes a chassis, a motherboard module, and a storage array module. The motherboard module and the storage array module are disposed in the chassis. The storage array module includes a first tray removably disposed in the chassis, a hard disk back panel fixed to a bottom of the first tray, and several hard disks hot-pluggably disposed in the first tray. The hard disk back panel is electrically connected to the motherboard module, and the hard disks are electrically connected to the hard disk back panel and driven to move into/out the chassis with the first tray.