The invention discloses a method for measuring the degree of forming of inner lining paper, which is characterized by comprising the following steps: cutting inner lining paper to be measured into a plurality of samples; selecting a sample, folding the sample in a right angle, putting the horizontal part on a horizontal test bed, and abutting the vertical part to a weight A; putting a weight B onthe horizontal part of the sample, and clamping the vertical part together with the weight A; sliding a weight C from the weight A along the horizontal direction to the weight B, stopping when sliding the weight C to be above the weight B and pressing the upper end of the sample by the weight C, immediately timing, after 8 seconds, horizontally taking up the weight C, and measuring the included angle between the upper end of the sample and the horizontal plane; and measuring all samples by the method, and averaging all the obtained data to obtain a mean value for indicating the degree of forming of the inner lining paper to be measured. The invention can obtain more accurate data for indicating the degree of forming of the inner lining paper, and the used measuring instrument has simple structure, easy acquisition of materials, easy manufacture, simple operation and easy mastering.