A method and an apparatus for monitoring a power consumption value of a DSL subscriber board in real time are provided. The method includes: monitoring a working state of each subscriber port on the DSL subscriber board, the number of subscriber ports in each working state, and an output power of each LD subunit in an LD unit on the DSL subscriber board; and 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.