A cloud computer includes a base, a host, and a battery, in which the host includes a motherboard, a memory connected to the motherboard, and a base connector connected to the motherboard, and the base includes a host connector corresponding to the base connector of the host, and a plurality of input/output ports to connect to peripherals. The battery is mounted on the host and connects to the motherboard to provide electronic power to the motherboard, and the host is detachably connected with the base.