The invention discloses a method for recovering a basic input output system (BIOS) and a computer device thereof. The computer device of the invention includes a motherboard, a power button, a BIOS storage unit, and an embedded controller. The BIOS storage unit is disposed on the motherboard, and it stores a first boot block code and a second boot block code. When the computer device is connected with a power supply to supply standby power to the motherboard, and the power button is not pressed, the embedded controller detects whether the first boot block code is damaged. If the first boot block code is damaged, the embedded controller recovers the first boot block code via the second boot block code.