Expansion liquid storage tank with high and low liquid level protection function

The utility model discloses an expansion liquid storage tank with a high-low liquid level protection function, which belongs to heat conduction oil heating and comprises an expansion liquid storage tank body and a liquid level monitoring system, the liquid level monitoring system comprises a liquid level transmitter and a remote display, and detection units of the liquid level transmitter respectively extend into the expansion liquid storage tank body from the top and the bottom of the expansion liquid storage tank body. The liquid level transmitter is in electric signal connection with the remote display, and the liquid level transmitter can transmit the liquid level height in the expansion liquid storage tank body to the remote display in real time through an electric signal, so that the liquid level height in the expansion tank can be observed in real time through the remote display at the distance without going to the field to check; and the height of the liquid level in the expansion liquid storage tank