Stationary carbon electrode voltammetry has been used for studying the electrochemical oxidation processes of 4,5-Di-hydro-1,2,4-triazin-6-one in acetonitrile. The electron process of dihydrotriazin electrochemical oxidation is shown to correspond to the multistage oxidation of both nonprotonated and protonated forms. Surface protonation is due to the rapid addition of protons formed during the electro-oxidation process of initial dihydrotriazin molecules. It leads to the formation of extra molecules in the protonated form which oxidize to the end product. The protonation of the final products is also shown. The electrochemical oxidation mechanism of dihydrotriazin has been verified by infrared and nuclear magnetic resonance analysis of products obtained during macroscale macroscale electrolysis at controlled potential.