The invention relates to a grabbing method for flexible materials and relates to the technical field of automatic material grabbing. The grabbing method comprises the following steps that firstly, a mechanical arm controls a grabbing device to move to the part over the materials to be treated and move to a set height; secondly, action controllers of the grabbing device control all sets of grabbing cantilevers to independently move, when the grabbing cantilevers move to the flexible contact target positions, position limit can detect signals, material loosening devices on the corresponding grabbing cantilevers move, the upper materials are separated from the lower materials through mechanical material loosening, and then a clamp claw device is started to grab the materials; and thirdly, after all the independent grabbing cantilevers grab the materials, action limit can detect signals, a mechanical arm lifts the whole grabbing device and conveys the whole grabbing device to an appointed position. The grabbing method replaces traditional manual carrying and solves the problem that when the mechanical arm grabs the flexible materials, the grabbing success rate is low or grabbing cannot be carried out, improves the grabbing efficiency and avoids the material damage problems, and the material cost is reduced.