A passive optical network terminal, system and method for implementing a subscriber line test are provided in the present document. The terminal includes a subscriber line interface module, a subscriber line driver module, a subscriber line resource management module and a Digital Signal Processing (DSP) module connected in sequence, wherein: the subscriber line interface module is configured to provide an analog interface; the subscriber line driver module is configured to: drive the corresponding hardware of a subscriber line through the analog interface, and output a detected subscriber line status to the subscriber line resource management module; the subscriber line resource management module is configured to: according to the subscriber line status, establish or release a media channel between a media server and the subscriber line resource management module under control of the Soft Switch (SS), output a test service prompt voice packet delivered by the media channel to the DSP module, and upload a tes
