The vacuum absorber disclosed by the invention includes: a rotatable cover that can be attached to a flat plane in vacuum adsorption mode to provided in the upper part; an adsorption plate combined below the cover and in vacuum adsorption on the flat plane; and height adjusting accessories located between the cover and the adsorption plate, and making the adsorption plate traverse in company with the rotation of the cover, wherein at least two fixed plates are formed on the inner side of the cover, at least two elasticity cards with elasticity that makes the fixed plates can slidaly move in the mutually contacted status are arranged on the inner side of the height adjusting accessories, and the fixed plates are clamped on the end side for fixing the cover. The inventive vacuum absorber can be hardly absorbed on the adsorption surface, to elevate the adsorption affinity, enhance the assembling character between members, so that a dual locking structure is formed to prevent the locking structure loosen phenomenon caused by external pressure.