Device and method for accurately measuring thickness and liquid level of magnesium in magnesium electrolytic cell

The invention discloses a device and a method for accurately measuring the thickness and the liquid level of magnesium in a magnesium electrolytic cell, and belongs to the technical field of magnesium electrolysis. The problem that in the prior art, the thickness and the liquid level of a magnesium layer in the magnesium electrolytic cell cannot be conveniently and rapidly measured is solved. The device comprises a first measuring cylinder (2) and a second measuring cylinder (5) which are arranged on an electrolytic cell shell (8), distance measuring devices (1) are arranged on the first measuring cylinder (2) and the second measuring cylinder (5), the lower end of the first measuring cylinder (2) is located above a magnesium layer (9), and the lower end of the second measuring cylinder (5) is located in magnesium chloride (10) below the magnesium layer (9). The liquid level of the magnesium layer can be directly measured through the distance measuring devices, the thickness of the magnesium layer can be calc