Zero-discharge treatment system and process for iron phosphate wastewater

The invention discloses a zero-discharge treatment system and process for iron phosphate wastewater. The zero-discharge treatment system comprises a washing wastewater treatment section which sequentially comprises a washing wastewater precipitation unit, a washing wastewater filtering unit, a washing wastewater ultrafiltration unit, a pre-concentration RO1 unit, a pre-concentration RO2 unit and a product water RO unit; the mother liquor treatment section sequentially comprises a synthetic mother liquor precipitation unit, a synthetic mother liquor filtering unit, a synthetic mother liquor ultrafiltration unit and a synthetic mother liquor RO concentration unit; the product salt production section sequentially comprises a concentration and evaporation unit, an ammonium sulfate crystallization unit, an ammonium dihydrogen phosphate cooling crystallization unit and a compound fertilizer crystallization unit. Through optimized combination of the technological process, continuous, stable and efficient operation o