The invention discloses a vacuum-sucking paper feeding mechanism for an offset press. The vacuum-sucking paper feeding mechanism comprises an automatic ascending-descending paper stacking table, paper guide rails, paper distributing claws, blowing pipes, vacuum sucking tube components, movable parts, a paper feeding platform, a vacuum suction pipe and a discharge pipe, wherein air suction and discharge are delivered by a vacuum pump. The automatic ascending-descending paper stacking table is provided with a transmission part which includes a pair of gears, a transmission shaft, chain wheels, chains, guide rails, a paper stacking table and a paper pressing plate, and provided with an electric button and a positioning photoelectric sensor to control operating of the motor, and paper on the paper stacking table is fed to the specified position. Suckers in the vacuum sucking tube components suck paper to the paper feeding platform; the movable parts on two sides are matched with transmission cams so as to support forward and backward moving of the vacuum sucking tube components, the paper feeding platform is provided with a front wheel pressure-flexible-adjustment component and a paper feed belt to convey paper backwards, and front wheels adjust pressure through leaf springs by the aid of adjusting screws. The vacuum-sucking paper feeding mechanism is quick and accurate and has no damage on paper, and clean and clear paper products can be printed smoothly.