Disclosed is a power saving system and power saving method for an intelligent robot, including a central processing unit, a first device group and a second device group. When a voltage level of the battery is changed to a second voltage level from the first voltage level, the central processing unit controls the first device group to stop receiving energy from the battery. When the voltage level of the battery is changed to a third voltage level from the second voltage level, the central processing unit controls the second device group to stop receiving energy from the battery. When the voltage level of the battery is changed to a voltage threshold value from the third voltage level, the central processing unit controls the intelligent robot to stop receiving energy from the battery.