A switch control circuit and a control method thereof. The switch control circuit comprises: a power supply, a control circuit, an infrared sensor, and a relay. A power supply circuit is configured to convert an alternating current into a direct current and supply the direct current to the control circuit, the infrared sensor, and the relay; when the switch control circuit is in an active state, the control circuit controls the relay to be turned on or off according to a signal of the infrared sensor and determines, according to a switching frequency of the power supply from a powered state to an unpowered state, whether to switch the switch control circuit from the active state to a failure closed state. When the switch control circuit is in a failure closed state, the relay is controlled to be closed, and after the power supply is switched from the powered state to the unpowered state, the relay is turned off, and the switch control circuit is in a failure off state; the switch control circuit is switched to the active sate after the power supply is switched from the unpowered state to the powered state again.