The invention relates to a pressure-sensitive transformer oil level gauge mounted on an oil charging and discharging pipe. The main technical features are that the pressure-sensitive transformer oil level gauge comprises an oil level gauge body, a butterfly valve, an oil level gauge dial, a pressure sensor and an oil level gauge measuring circuit, wherein the oil level gauge body is vertically mounted at a lower end of the oil charging and discharging pipe by the butterfly valve; the oil level gauge dial is mounted outside the oil level gauge body; the pressure sensor is mounted in the oil level gauge body and is located outside the butterfly valve; and the oil level gauge measuring circuit is mounted in the oil level gauge body and is connected with external equipment by a power supply and a signal cable. The pressure-sensitive transformer oil level gauge provided by the invention has reasonable design, measures a pressure of transformer oil by the pressure sensor and converts the pressure into a height from the oil level gauge to an oil surface, while correcting height by a real-time operating temperature of a transformer so as to realize accurate measuring and real-time monitoring functions for an oil level of a capsule or diaphragm type oil conservator and play a role of remote monitoring of the oil level, and has characteristics of accurate measurement, high reliability, convenient reading and the like.