The utility model relates to a vacuum booster without a briquetting device, and belongs to the technical field of automobile braking. The feedback disc is in interference fit with the valve body, theair valve seat is in clearance fit with the valve body, and the air valve seat is in clearance fit with the feedback disc. The booster has the advantages that the structure is novel, the function of the pressing block is replaced by air valve seat parts, the height and the diameter of the air valve seat are serialized, the booster generates different jump values and boosting ratios, and thereforeabnormal vibration noise generated by the pressing block of the booster is eliminated.