The invention relates to the field of wastewater treatment, and especially relates to an industrial acidic wastewater treatment process. The process mainly comprises the following steps: (1) the acidic wastewater is subjected to acid filtration through a multi-section nano-filtration system, such that a retained water flow and a permeated flow are obtained; (2) the retained water flow obtained in the step (1) is subjected to a high-density sludge process treatment; (3) the permeated flow obtained in the step (1) is neutralized with an alkaline material, and is discharged. According to the invention, the overall economy of acidic wastewater treatment process operation is significantly improved; volume and doses of lime and acid of a chemical treatment and separation system are greatly reduced; the amount of gypsum sludge or residues of harmful waste treatment and discharge are minimized.