The invention provides a pressure gauge and a pressure monitoring system. The pressure gauge comprises a pressure gauge body, wherein the pressure gauge body comprises a pressure gauge shell, a main control chip, a pressure sensor, a plurality of pressure mode indicator lamps and a communication module are arranged in the pressure gauge shell, and the surface of the pressure gauge shell is provided with a the plurality of pressure mode indicator lamps; the main control chip is connected with a background monitor by virtue of the communication module; the pressure gauge shell is provided with apressure interface, the pressure interface is communicated with SF6 gas, and the pressure sensor is arranged on the pressure interface; and the main control chip receives a pressure signal transmitted by the pressure sensor, the current pressure mode is determined, and the corresponding pressure mode indicator lamp is turned on according to the pressure signal and the pre-classified different pressure modes. The current pressure state can be intuitively and timely determined, a pressure value is read in real time, the manual transcription is not needed, and the influence of the personal subjective factor for on the data reliability is avoided.