A computer host power management system having extension cord sockets is disclosed, comprising a socket body providing alternative current (AC) power to a computer host, in which the socket body includes AC power output plugholes, an AC power input plug, a control device and a power supply device. Herein the control device is configured with Universal Serial Bus (USB) ports and capable of determining whether the computer host signal transferred from the USB port is normal. In case of abnormal conditions, a second microprocessor in the power supply device is driven to cause a power automatic switch to turn off the AC power such that the computer host enters into the shutdown status. Later, after a lapse of preset time, the second microprocessor drives once again the power automatic switch to turn on AC power thereby rebooting the computer host.