Computer and power supply circuit thereof

The utility model is applicable to the field of computers, and provides a computer and a power supply circuit thereof. The power supply circuit of the computer consists of a computer mainboard power supply unit for supplying power for a computer mainboard, and a display power supply unit for supplying power for a display, and the computer mainboard power supply unit and the display power supply unit are respectively connected to a first secondary winding and a second secondary winding of an isolating high-frequency main transformer, therefore, a power supply negative electrode of the computer mainboard power supply unit and a power supply negative electrode of the display power supply unit are isolated by the isolating high-frequency main transformer so as to avoid interference to the picture of the display, furthermore, when a computer host is in standby and sleep statuses, the power supply of the display is closed, the zero power consumption of the display in standby status can be achieved; in addition, the