The present invention relates to a thickness fluctuation separator capable of varying the thickness of the separator of a lead acid battery, and more particularly, by forming a wing-shaped protrusion at regular intervals on the separator to allow flexible thickness change, when the internal specifications of the electrode plate are changed. In addition, it relates to a thickness-variable separator capable of changing the thickness of a separator of a lead-acid battery that can continuously perform a process without the need for replacement of the separator. Through the present invention, it is possible to flexibly change the thickness by forming wing-shaped projections at regular intervals on the separator, so that even when the internal specifications of the electrode plate are changed, the process can be continuously performed without the need to replace the separator. do.
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