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The results of investigations into the polarisation of line radiation of the multiple charged ion plasma of high-current Z-pinches are presented in this paper. The experiments were performed on the ‘Angara-5-1’ facility at Z-pinch currents of 2.5–3.5MA. A dense high-temperature pinch was produced by the compression of a hollow Ar gas jet injected by an electromagnetic valve with a supersonic nozzle. In the process of pinch compression, the following plasma parameters were achieved: electron density n e ∼ 1021cm−3 and electron temperature Te ∼1keV. The radiation spectrum was measured by the use of a crystal spectrograph in which mica (2d=19.9 A)served as a disperse element. The spectrum of the He-like ion of Ar was detected in reflection orders II and III. On the basis of the measurements performed, conclusions on the degree of polarisation of the plasma radiation have been drawn.