Liquid level acquisition method and device of vertical oil tank and liquid level early warning system for oil receiving and transmitting

The invention relates to a method and a device for liquid level acquisition of a vertical oil tank, wherein the method comprises the steps: determining the predicted liquid level of the target oil volume in the vertical oil tank; extracting the predicted oil volume corresponding to the predicted liquid level from the database; obtaining the initial oil volume and the volume per liquid level of thevertical oil tank; calculating the liquid level deviation according to the initial oil volume, the predicted oil volume and the volume per liquid level; correcting the predicted liquid level by utilizing the liquid level deviation to obtain the liquid level value of the target oil volume. The liquid level acquisition method of the vertical oil tank corrects the predicted liquid level of the target oil volume by the liquid level deviation, improves efficiency and accuracy of acquiring the liquid level corresponding to the target oil volume through quickly and accurately acquiring the liquid level corresponding to the