Abstract: An apparatus for monitoring a leakage of a pipe line includes a plurality of measurement sensor units, installed on a plurality of sections having predetermined intervals on the pipe line formed to transfer the fuel oil pressured and fed from a fuel oil storage tank, for measuring change amounts of a flow rate, a temperature, a flow amount, and energy of the fuel oil for each of the plurality of sections, and a leakage detector unit for receiving sensing signals corresponding to the change amounts of the flow rate, the temperature, the flow amount, and the energy of the fuel oil from the plurality of measurement sensor units and analyzing the sensing signals to decide whether the pipe line is leaked or not.