The present disclosure relates to a technical field of display panel manufacture, in particular relates to a film material attaching method and a film material attachment device. The method includes: putting a film material on a backing material on a base table, a side of the film material with an adhesive layer facing towards the backing material to be attached and aligning the film material and the backing material; pressing a corner of the film material on the base table by an attaching roller which will roll along a preset direction, wherein an included angle between the preset direction and either side of the corner of the film material is smaller than an angle of the corner of the film material. By attaching the film material using an attaching roller at an angle with respect to the film material, instead of attaching the film material directly at one side by an attaching roller in traditional attaching process, the present disclosure can solve the problem that a linear bubble is easily to be generated at the edge of the film material in the attaching process.