The invention relates to a displacement magnification corrugated web damper, which comprises an upper connecting plate with a rack, a gear, a duplicate gear, a center shaft, a lower connecting plate with a rack, a frame, a sliding groove cross beam, a fixing bottom beam and a corrugated web damper body. The displacement magnification corrugated web damper has the characteristics that the structuredesign is simple, selected material and machining costs are low, overall mounting and construction are convenient and rapid, and firmness and durability are achieved; and when the interlayer deformation speed and displacement of a structure are relatively small, through rotation of the duplicate gear, deformation can be quickly enlarged effectively, thus the relative displacement of the damper becomes large, damping of the structure is increased, the energy-dissipating earthquake reduction capacity of the damper is given into full play, thus the overall energy-dissipating capacity of the structure is improved, and damage caused by the earthquake response to the building structure is effectively reduced.