The invention discloses a pipeline leakage judging method and device and belongs to the field of pipeline systems. The method includes the steps that in the transporting stopping and pressure stabilizing process, the pipeline pressure of a pipeline and the medium temperature of a medium conveyed in the pipeline are recorded; the pipeline body volume change value and the medium volume change valueof the pipeline are calculated according to the pipeline pressure and the medium temperature; and when the medium volume change value is equal to the pipeline body volume change value, whether leakagehappens to the pipeline or not is judged. The problems that the pressure value of the whole section of pipeline is reduced, consequently, a worker cannot correctly estimate the pressure value to reduce the predicated value, and whether leakage happens to the pipeline or not cannot be correctly judged are solved; and the effects that the temperature and pressure changes are counted after transportation of the pipeline is stopped, and the accuracy for predicating whether leakage happens to the pipeline or not is improved are achieved.