Silicon and it’s composites are widely used to create new electrochemical devices for energy conversion and storage. Currently, research is being actively conducted aimed at developing methods for obtaining micro- and nano-sized silicon from the molten salts. In this regard, the basic regularities of silicon electrodeposition on glassy carbon from the KCl–CsCl–K2SiF6 melt at a temperature of 690°C were studied by cyclic chronovoltammetry and square-wave voltammetry in this work. It was shown that the electroreduction of silicon ions on glassy carbon under experimental conditions proceeds in one electrochemically reversible 4‑electron stage. The formal-kinetic parameters of the electroreduction of silicon ions under conditions of non-stationary polarization were determined. According to the Berzins-Delahay equation for an electrochemically reversible process, the diffusion coefficient of the silicon electroactive ions was estimated, which was of 2.75 · 10–5 cm2/s. Silicon was electrodeposited on glassy carbon in the galvanostatic mode at a cathode current density of 25 and 50 mA/cm2. As a result, sediments of fibrous morphology with an average diameter of 0.12 to 0.80 µm were obtained.