The invention discloses a motherboard module array, which is suitable to be arranged in a case of a server. The motherboard module array comprises a group of separating boards and a plurality of motherboard modules, wherein the separating boards are provided with a group of load bearing rails extending inwards; each motherboard module comprises a motherboard with a plurality of components and a removable tray for bearing the motherboard; and the removable trays are arranged on the load bearing rails and are suitable to be pulled out from the case.