Pretreatment method of refractory gold ore

The invention discloses a pretreatment method of refractory gold ore, which is characterized by comprising the following steps of: adopting a dry-wet two-level ball grinder activating and impregnation process; carrying out first-level dry grinding by adopting a vibratory ball grinder and efficiently improving the mineral activity on the basis of energy conservation through adjusting the content of quartz in a ball grinding sample; carrying out second-level wet grinding by adopting a stirred ball grinder, simultaneously carrying out the mineral grain size reduction and the acid addition and preimpregnation, further damaging a mineral structure, realizing the complete oxidation and decomposition of sulfide ore at a lower temperature and a pressure through controlling the content of sulfuricacid, the solid-to-liquid ratio and the oxygen partial pressure in a reaction vessel and restraining the generation of elemental sulfur. The pretreatment method has the advantages of low extraction temperature, short time and low energy consumption.