The invention discloses an industrial acidification system and method for offshore oil fields and oil-water wells. The industrial acidification system comprises an acid liquid preparation unit, an acidizing treatment unit and a residual liquid recycling unit which are adjacent to one another. The acid liquid preparation unit is connected with a wellhead of one oil-water well or wellheads of the multiple oil-water wells in the acidizing treatment unit through an acid injection pipeline. An acid injection adjusting subunit, a control subunit and a data analyzing subunit are arranged on the acid injection pipeline. Producing wells of the one or more oil-water wells are connected with the residual liquid recycling unit through a liquid return pipe. Flowback residual liquid is neutralized in the residual liquid recycling unit and returned. The industrial acidification method comprises the following steps that the industrial acidification system for the offshore oil fields and the oil-water wells is obtained by utilizing and connecting an offshore oil field production platform and anchoring arrangement; acidizing treatment preparation is conducted; industrial acidizing treatment is conducted on the oil-water wells through the industrial acidification system for the offshore oil fields and the oil-water wells; and acidification aftertreatment is conducted according to the types of the oil-water wells.