A method for managing a multi-wavelength passive optical network, which is applicable to an optical module for the multi-wavelength passive optical network, characterized by comprising: operating the optical module to extract a module management signal from a received signal inputted through an optical signal interface, wherein the module management signal carries a management message related to the optical module, wherein the optical module extracts the module management signal and a device management signal from the received signal inputted through the optical signal interface, wherein the module management signal carries the management message related to the optical module, and the device management signal carries a management message related to a multi-wavelength passive optical network device, wherein operating the optical module to the module management signal and the device management signal from the received signal inputted through the optical signal interface comprises: operating the optical module to distinguish between the module management signal and the device management signal, wherein the operating the optical module to distinguish between the module management signal and the device management signal comprises: operating the optical module to distinguish between the module management signal and the device management signal according to frequencies of the signals, wherein the frequency of the module management signal is different from the frequency of the device management signal; or operating the optical module to distinguish between the module management signal and the device management signal according to wavelengths of the signals, wherein the wavelength of the module management signal is different from the wavelength of the device management signal. operating the optical module to extract a module management signal from a received signal inputted through an optical signal interface, wherein the module management signal carries a management message related to the optical module, wherein the optical module extracts the module management signal and a device management signal from the received signal inputted through the optical signal interface, wherein the module management signal carries the management message related to the optical module, and the device management signal carries a management message related to a multi-wavelength passive optical network device, wherein operating the optical module to the module management signal and the device management signal from the received signal inputted through the optical signal interface comprises: operating the optical module to distinguish between the module management signal and the device management signal, wherein the operating the optical module to distinguish between the module management signal and the device management signal comprises: operating the optical module to distinguish between the module management signal and the device management signal according to frequencies of the signals, wherein the frequency of the module management signal is different from the frequency of the device management signal; or operating the optical module to distinguish between the module management signal and the device management signal according to wavelengths of the signals, wherein the wavelength of the module management signal is different from the wavelength of the device management signal. operating the optical module to distinguish between the module management signal and the device management signal, wherein the operating the optical module to distinguish between the module management signal and the device management signal comprises: operating the optical module to distinguish between the module management signal and the device management signal according to frequencies of the signals, wherein the frequency of the module management signal is different from the frequency of the device management signal; or operating the optical module to distinguish between the module management signal and the device management signal according to wavelengths of the signals, wherein the wavelength of the module management signal is different from the wavelength of the device management signal. operating the optical module to distinguish between the module management signal and the device management signal according to frequencies of the signals, wherein the frequency of the module management signal is different from the frequency of the device management signal; or operating the optical module to distinguish between the module management signal and the device management signal according to wavelengths of the signals, wherein the wavelength of the module management signal is different from the wavelength of the device management signal.