The utility model discloses a storage tank with level gauge, including a jar body, jar body one side fixed mounting has the liquid level pipe, the liquid level union coupling has an intercommunication liquid level pipe and jar connecting pipe of the body, the internal float that is equipped with of jar, the intraductal buoy that is equipped with of liquid level, the bracing piece has been set firmly along vertical direction in the connecting pipe, which comprises a tank body, the lever both ends wear to establish the connecting pipe both ends respectively, all be equipped with between lever one end and float and the lever other end and the buoy and connect the rope, the bracing piece is less than the distance of bracing piece to the relative float one end of lever to the distance of the relative buoy one end of lever. Because the bracing piece is less than bracing piece to the distance of the relative float one end of lever to the distance of the relative buoy one end of lever, the lever is located jar distance of internal one end decline and is greater than the distance that the lever is located the rising of the intraductal one end of liquid level promptly, has played the effect of reducing the stroke. The moving distance who makes the buoy is little, has made things convenient for the reading.