The invention discloses a speed measuring method of a flotation video based on attribute matching. The method comprises the following steps: the luminance and the area of a target area meeting the set threshold is extracted in a first frame image; a matching area which matches the target area is searched in a second frame image, after the matching is successful, a recognized target is verified by calculating the position vector difference between the two adjacent targets in the two continuous images to effectively ensure the accuracy of the target recognition; and then the displacement of the target area between the first frame image and the second frame image is calculated according to the results of matching and verification, and the traveling speed of the target area is calculated according to the product of the displacement and frame frequency. The measuring method of the floatation vide has the advantages of rapid speed measurement and good effect.