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The results of experimental research are presented on the fundamental possibility and conditions of the current sheet formation under high‐pressure He‐filling in the 2D magnetic fields with a null‐line. It was revealed that the formation of the current sheet and efficient plasma compression into the planar sheet could take place under high initial pressure, provided that the gradient of the magnetic field was large enough. The maximal electron density in the sheet peaked at ∼1017 cm—3 and was an order of magnitude higher than the initial electron density and the atomic density of the gas. Both the electron and ion temperatures were lower than 5 eV resulting in suppression of the electron thermal conductivity along the sheet surface. In these conditions the other loss channels played a dominant part, specifically the losses due to plasma radiation.