The principal possibility of nanosize carbon-material synthesis in macroamounts for short intervals of time using the method of electric explosion in a liquid is shown. Conformities with the law of obtaining nanocarbon upon many-cycle treatment are explored; these demonstrated a swaying, falling practically to zero, character of an increasing material mass with an increase in the cycles. The mass of the obtained nanocarbon is determined by the amount of atoms in the chains of the hydrocarbons, by the injected energy in a plasma channel during one pulse, and the quantity of treatment cycles.