The invention relates to a detection control design method for the liquid level of emulsion sludge, which comprises the following steps: (A) liquid to be measured is contained in a box body or a tank body; (B) a liquid level floating drum is hung in the box body or the tank body by a rope through a guide pulley block, and the other end of the rope is hung outside the box body or the tank body by the guide pulley block and is connected with a slide block and a pointer; (C) the slide block and the pointer move up and down in a guide groove of the slide block; when the weight of the slide block is greater than the weight of the floating drum, the floating drum ascends, and the slide block descends; (D) by injecting the liquid into a liquid injection opening of the floating drum step by step, the entire stress situation of a liquid level meter is balanced until the liquid level meter works normally; and (E) after the regulation is finished, the liquid injection opening is sealed so as to prevent the evaporation of the liquid in the floating drum to destroy the balance. The detection control design method has the advantages of high measurement accuracy, simple structure of a detection control device, low manufacturing cost, convenient operation, simple maintenance, wide application range and the like, is intuitive and reliable and can be used for the detection control of the liquid level of different liquid media.