The present invention provides a method for inquiring and managing the configuration data of the element device of local network of EPON, wherein the method comprises the following steps: storing a plurality of kinds of configuration data on the OLT of EOPN; adopting one in the configuration data for configuring OLT and ONU in the initialization of OLT, and duplicating the configuration data as other configuration data when the configuration is succeeded; defining a private MIB object ''data inquiry mode''; controlling the type of data returned from the element device of the local network by a network controller through writing the value of the object of ''data inquiry mode''; and firstly inquiring the value of the object of the ''data inquiry mode'' by the element device of the local network when the network controller executes the inquiry operation, and confirming the type of the returning data according to the result. The invention makes that the element device of local network of EPON supports the inquiry to a plurality of kinds of configuration data and supports the self-adopting inquiry mode. The method is flexible to control and easy to realize. The efficiency and flexibility for managing and maintaining the element device of the local network of EPON are increased.