The invention provides a treatment process for wastewater produced in chemical production of p-nitroaniline, o-nitroaniline and corresponding phenylamines. The treatment process comprises a material recovery section, a wastewater acidifying section, a formaldehyde condensation section, a micro-electrolysis section, an oxidation section, and a nighttime neutralization section and an ammonium chloride stock solution section. The treatment process is mainly characterized in that processing is carried out according to the sections; before treatment of the wastewater and in the material recovery section, a totally-reacted water-solid mixture in an ammonolysis kettle is pressed into a washing kettle or crystallization kettle by an air compressor for solid-liquid separation; since p-nitroaniline,o-nitroaniline and other phenylamines are soluble in hot water, treatment of p-nitroaniline and o-nitroaniline can be accomplished by reactions at a medium-and-high temperature of 170 DEG C to 180 DEG C; the wastewater is pumped into a filter press equipped with 800-to-1500-mesh filter cloth by using an antiseptic centrifugal pump for extraction of materials in the wastewater; and the wastewaterin which the materials have been extracted is pumped into a wastewater tank No. 2. The treatment process of the invention has the beneficial effect that the product wastewater is filtered by the filter press equipped with the 800-to-1500-mesh filter cloth so as to allow the wastewater to become granular crystals, which meets the requirements of commercial-grade products.