The invention discloses a cable terminal and a fiber temperature monitoring system built in the same. The cable terminal comprises a conductive wire core, an XLPE insulated layer wrapping the conductive wire core, an enhanced insulated layer sleeving the outer surface of the XLPE insulated layer, and a temperature-sensing fiber wrapping the outer surface of the enhanced insulated layer. The temperature-sensing fiber is covered with and fixed by a silicone rubber material layer and leads out of the port of the cable terminal. The fiber temperature monitoring system built in the cable terminal comprises the cable terminal, a propositioned fiber, a fiber temperature-measuring device, and a data analysis system which are successively connected. The temperature-sensing fiber is implanted into the cable terminal and monitors the local temperature inside the cable terminal in real time, thereby accurately evaluating the temperature state of the cable terminal in real time, timely finding out a fault hidden danger, achieving real-time diagnosis of the temperature state of the cable terminal, and guaranteeing the normal operation of the cable terminal.