The invention relates to an electric field experiment device for inhibiting coking of hydrocarbon fuel in a metal pipe and specifically belongs to the technical field of tests of the coking of the hydrocarbon fuel, aiming at solving insulation and sealing problems of increasing an electric field in the metal pipe through an electrode wire. The electric field experiment device comprises an electricfield system with a structure shaped like a Chinese character 'Tu', and a reaction kettle with threads at two ends, wherein the electric field system provides an electric field for the reaction kettle; the electric field system is in thread connection with the reaction kettle. The electric field experiment device provided by the invention is simple in structure and cheap in price and is easy to realize in the aspect of a technology. The electric field experiment device provided by the invention can bear relatively high temperature and pressure; a sealed clamping sleeve is adopted so that thesealing effect can be realized and the position of the electrode wire also can be fixed; the insulation and sealing problems of increasing the electric field in the metal pipe through the electrode wire are sufficiently solved.