Vacuum booster of through-rod type

The utility model relates to a through bar vacuum booster belonging to a vacuum booster in the automobile brake system. The front casing components and the back casing components are riveted to ensure their film sheet blocked fixedly and sealed from outer, seal ring components and the back casing components are riveted to ensure fixed and sealed. Control valve components are riveted to ensure connected and sealed, the film sheet and the valve body are riveted at rest by interference, the seal ring components and the valve body are sealed sliding by interference, the two through bars are sealed by compacting respectively with O-typed seal ring of the front casing, the bearing holder connects fixedly with the front casing, the two through bar connects sliding with the film sheet by interference, and connects with the back casing components by riveting, aided disc is riveted with the valve body. Its advantages are that it has new structure, its casing will not deform owing to bearing pressure during braking, its weight is light, such characteristics improve brake reliability, reduce the weight of the whole vehicle and can decrease traffic accidents occurring.