The invention discloses a coal chemical industry wastewater pretreatment method, which belongs to the technical field of coal chemical industry wastewater treatment, and comprises the following steps of: oil removal and solid removal, pre-deoiling, deacidification and deamination, extraction and dephenolization, solvent / phenol recovery and deep dephenolization. According to the coal chemical industry wastewater pretreatment method, heavy oil, light oil, oil residues, ammonia, acidic components and phenol in the wastewater are removed, the operation load of a subsequent biochemical treatment section is reduced, and favorable conditions are created for biochemical treatment of the wastewater; floating oil, dispersed oil, emulsified oil and dissolved oil in the wastewater are removed in advance before deacidification and deamination, so that the problem of pollution and blockage of a deacidification and deamination system is solved; through deep dephenolization, the phenol content of the pretreated purified water is further reduced, and the impact resistance of a subsequent biochemical treatment section is improved; and the recycled heavy oil, light oil, oil residues, acid gas, crude ammonia gas and crude phenol are sent out as products, and recycling treatment and comprehensive utilization of the coal chemical industry wastewater are achieved.