The invention discloses a supercritical water oxidation method for processing wastewater generated in explosive production. A counterbalance valve is arranged on the tail end of a pre-heater of a conventional supercritical water oxidation device; through the counterbalance valve, the pressure of the section from the tail end of the pre-heater to the outlet of a condenser is controlled to be lower than the critical pressure value of water so as to form a sub-critical area, thus inorganic salts in wastewater are collected and recovered before entering a reactor, and solved is the problem that in the prior art, the wastewater inlet pipeline of a supercritical water oxidation device is obstructed by inorganic salts. At the same time, technological parameters such as reaction temperature, reactor pressure, water inlet, introduced oxygen amount, and the like, are adjusted to effectively remove organic substances in explosive production wastewater with a COD of 80000 to 300000 mg/L. The method has the advantages that the method is high efficient, no secondary pollution is generated, self heating is realized, and the operation cost is low when the energy is recovered and optimized.