Power sourcing equipment for use in a Power over Ethernet, PoE, network, wherein the power sourcing equipment comprises a power supply port, a power sourcing equipment PSE chip, a low-power detection component, a control switch, and a power switch, and the power supply port is connected to the control switch, the PSE chip and the low-power detection component are separately connected to the control switch, and the PSE chip is connected to the power switch; the low-power detection component is configured to: detect, at a low voltage, whether the power supply port is connected to a valid powered device, PD, when the low-power detection component is connected to the power supply port; and send a first instruction when the power supply port is connected to the valid powered device PD, wherein the first instruction is used to instruct the control switch to connect the PSE chip and the power supply port and disconnect the low-power detection component from the power supply port, and instruct the power switch to connect the PSE chip and a power supply; the control switch is configured to: according to the first instruction, connect the PSE chip and the power supply port, and disconnect the low-power detection component from the power supply port; and the power switch is configured to enable the power supply of the PSE chip to be connected according to the first instruction; wherein before detecting, at a low voltage, whether the power supply port is connected to a valid powered device, PD, the power supply port is connected to the low-power detection component, the power supply port is disconnected from the PSE chip, the PSE chip is disconnected from the power supply; wherein when the PSE chip is connected to the power supply port, and the PSE chip is connected to the power supply, the PSE chip is configured to send a status notification to the low-power detection component when detecting that the power supply port is in a non-power supplied state, wherein the status notification is used to instruct the low-power detection component to send a second instruction, and the second instruction is used to instruct the control switch to disconnect the PSE chip from the power supply port and connect the low-power detection component and the power supply port, and instruct the power switch to disconnect the PSE chip from the power supply; the control switch is further configured to: according to the second instruction, disconnect the PSE chip from the power supply port, and connect the low-power detection component and the power supply port; and the power switch is further configured to disconnect the PSE chip from the power supply according to the second instruction. the power sourcing equipment comprises a power supply port, a power sourcing equipment PSE chip, a low-power detection component, a control switch, and a power switch, and the power supply port is connected to the control switch, the PSE chip and the low-power detection component are separately connected to the control switch, and the PSE chip is connected to the power switch; the low-power detection component is configured to: detect, at a low voltage, whether the power supply port is connected to a valid powered device, PD, when the low-power detection component is connected to the power supply port; and send a first instruction when the power supply port is connected to the valid powered device PD, wherein the first instruction is used to instruct the control switch to connect the PSE chip and the power supply port and disconnect the low-power detection component from the power supply port, and instruct the power switch to connect the PSE chip and a power supply; the control switch is configured to: according to the first instruction, connect the PSE chip and the power supply port, and disconnect the low-power detection component from the power supply port; and the power switch is configured to enable the power supply of the PSE chip to be connected according to the first instruction; wherein before detecting, at a low voltage, whether the power supply port is connected to a valid powered device, PD, the power supply port is connected to the low-power detection component, the power supply port is disconnected from the PSE chip, the PSE chip is disconnected from the power supply; wherein when the PSE chip is connected to the power supply port, and the PSE chip is connected to the power supply, the PSE chip is configured to send a status notification to the low-power detection component when detecting that the power supply port is in a non-power supplied state, wherein the status notification is used to instruct the low-power detection component to send a second instruction, and the second instruction is used to instruct the control switch to disconnect the PSE chip from the power supply port and connect the low-power detection component and the power supply port, and instruct the power switch to disconnect the PSE chip from the power supply; the control switch is further configured to: according to the second instruction, disconnect the PSE chip from the power supply port, and connect the low-power detection component and the power supply port; and the power switch is further configured to disconnect the PSE chip from the power supply according to the second instruction.