The utility model discloses an early warning device of transformer substation, including transformer substation's main part, warning stereo set, remote infrared probe, temperature sensor and level sensor, the burglary -resisting door is equipped with in the dead ahead of transformer substation's main part, the burglary -resisting door openly is equipped with the handle, upper portion and lower part in the burglary -resisting door side are installed respectively to the pickproof lock, IC -card card swiping system's below is provided with infrared probe closely, the camera is just to the positive place of transformer substation's main part, the upper right side of warning stereo set is provided with remote infrared probe, remote infrared probe all has the setting in transformer substation's main part same position all around. The utility model discloses a prevent the mistake and go into, prevent that multiple early warning technology such as invasion, flood prevention combine together that can provide comprehensive early warning protection to the transformer substation, adaptability is wide, the equipment of having realized replaces artifically, has reduced the maintenance cost of transformer substation, has improved work efficiency.