The invention discloses a low-pressure-stage last-stage moving blade of an efficient industrial steam turbine 3.2m<2> in exhaust area. The low-pressure-stage last-stage moving blade is of a variable cross-section twisted blade and is composed of a blade body, a blade root and a tiepiece boss which is arranged on the blade body; the working portion of the blade namely the blade body is the variable cross-section twisted blade which is laminated by a plurality of characteristic cross sections according to a specific law, the contour line of the characteristic cross sections is a closed curve enclosed by an inner-arc curve and a back-arc curve, the cross sections continuously smoothly transit along the blade height direction from the root to the top according to the lamination law, the cross-section area gradually decreases from the root to the top, spaces between the every two neighboring cross sections are twisted relatively, the exhaust area of the low-pressure-state last-stage moving blade of the efficient industrial steam turbine is 3.2m<2> and can be used for an industrial turbine set of 150,000kw level and stage-4 low-pressure-stage last stage, and operation within a bigger back pressure range can be achieved. By the arrangement, efficient variable-working-condition operation performance is achieved, and combined cycle efficiency is improved.