The invention discloses a test method and a test device for bending drapability of fabrics. The specific method of the invention is as follows: step one, ironing the fabric to be tested to be flat, and cutting into n rectangular samples; step two, respectively cutting a circular hole in the middle of each of the n rectangular samples; step three, enabling cylindrical bulge of a test column to penetrate through the round holes of the n rectangular samples; step four, placing weight at the top of the test column; step five, one minute after placing the weight, according to i being equal to 1, 2,3. . . 2n, performing the step 6 in sequence; step six, sliding up the ith triangle ruler, reading out the scale value Xi of the rectangular specimen width edge on the ith triangle ruler and the scale value Yi of the position, on the test column, of the scale edge of the ith triangle ruler; step seven, calculating the bending drape coefficient. The formula is shown in the description. The test method and the test device can simultaneously test the fabric bending performance and drape performance, are simple and convenient and have strong operability.