The invention discloses an energy saving and consumption reducing method for treating oil and gas field oil-base drilling cuttings through supercritical water oxidation. The method comprises two main steps of heat immersion cleaning for oil-base drilling cuttings and organic wastewater supercritical water oxidation and comprises the specific steps that waste heat high-temperature liquid produced by carrying out supercritical water oxidization on organic wastewater is utilized for eluting organic matter in the oil-base drilling cuttings in an immersion cleaning kettle and transferring the organic matter into water at first, and organic wastewater is formed; the organic wastewater is pressurized and preheated and then mixed with an oxidizing agent to enter a supercritical water oxidation reactor, and organic pollutant is thoroughly oxidized and degraded; solid-liquid products are discharged from a slag outlet of the reactor, gas-liquid products enter the immersion cleaning kettle by passing through a buffer tank from a discharge outlet in the reactor, and the next cycle is started. According to the energy saving and consumption reducing method, no additional energy consumption is caused, the treated object oil-base drilling cuttings is converted into organic wastewater, the supercritical water oxidation treating difficulty is lowered, the probability that equipment abrasion is caused when solid particles in oil-base drilling cuttings exist is reduced, cooling water used for cooling high-temperature liquid is saved, and the targets of energy saving and consumption reducing are achieved.