The invention discloses a high-load file robot based on a flexible manipulator. The invention belongs to the field of file robots, and particularly relates to the high-load file robot based on a flexible manipulator and a using method of the high-load file robot. The high-load file robot device based on the flexible manipulator comprises a file box, a cooperation arm, an intelligent moving platform, a mechanical clamping jaw, a lifting mechanism and a temporary storage bin. The high-load file robot based on the flexible manipulator and the using method thereof have the beneficial effects that the defect that in the prior art, management is disordered, the management efficiency is lower, the size is larger, the field construction strength is high, a grabbing mechanism is not flexible enough, and the precision cannot meet the current file storing and taking requirements are overcome. Reasonable integration with dense files is achieved, automatic grabbing, checking and inspection of the files are completed, the maximum grabbing quality of the files is 5 kg, and high-load grabbing of the files can be achieved.