A method for monitoring a power consumption value of a digital subscriber line, DSL, subscriber board in real time, comprising: monitoring a working state of each subscriber port on the DSL subscriber board, the number of subscriber ports in each different working state, and an output power of each line driver, LD, subunit in an LD unit on the DSL subscriber board; characterized in that the method further comprises: calculating a power consumption value of the DSL subscriber board in real time according to a monitoring result and preset electrical parameters of each functional unit when a subscriber port is in a different working state, wherein the different working state is one of an inactive state, an activating state and an active state; wherein the DSL subscriber board comprises functional units and the functional units comprise the LD unit, a digital front end, DFE, unit, a CPU unit, and a convergence unit; and wherein the calculating the power consumption value of the DSL subscriber board in real time comprises: when a subscriber port is in a different working state calculating output power and power loss values of an LD power supply that supplies power to the LD unit and a digital front end, DFE, power supply that supplies power to a DFE unit, a total power consumption value of the DSL subscriber board, and a power consumption value of each subscriber port on the DSL subscriber board in real time. monitoring a working state of each subscriber port on the DSL subscriber board, the number of subscriber ports in each different working state, and an output power of each line driver, LD, subunit in an LD unit on the DSL subscriber board; characterized in that the method further comprises: calculating a power consumption value of the DSL subscriber board in real time according to a monitoring result and preset electrical parameters of each functional unit when a subscriber port is in a different working state, wherein the different working state is one of an inactive state, an activating state and an active state; wherein the DSL subscriber board comprises functional units and the functional units comprise the LD unit, a digital front end, DFE, unit, a CPU unit, and a convergence unit; and wherein the calculating the power consumption value of the DSL subscriber board in real time comprises: when a subscriber port is in a different working state calculating output power and power loss values of an LD power supply that supplies power to the LD unit and a digital front end, DFE, power supply that supplies power to a DFE unit, a total power consumption value of the DSL subscriber board, and a power consumption value of each subscriber port on the DSL subscriber board in real time. calculating a power consumption value of the DSL subscriber board in real time according to a monitoring result and preset electrical parameters of each functional unit when a subscriber port is in a different working state, wherein the different working state is one of an inactive state, an activating state and an active state; wherein the DSL subscriber board comprises functional units and the functional units comprise the LD unit, a digital front end, DFE, unit, a CPU unit, and a convergence unit; and wherein the calculating the power consumption value of the DSL subscriber board in real time comprises: when a subscriber port is in a different working state calculating output power and power loss values of an LD power supply that supplies power to the LD unit and a digital front end, DFE, power supply that supplies power to a DFE unit, a total power consumption value of the DSL subscriber board, and a power consumption value of each subscriber port on the DSL subscriber board in real time. when a subscriber port is in a different working state calculating output power and power loss values of an LD power supply that supplies power to the LD unit and a digital front end, DFE, power supply that supplies power to a DFE unit, a total power consumption value of the DSL subscriber board, and a power consumption value of each subscriber port on the DSL subscriber board in real time.