A sealing and inflating assembly includes a tire repairing container for receiving a sealing preparation, an outlet piece attached to a mouth opening of the tire repairing container and having an inlet conduit and an outlet conduit, the outlet piece includes a pipe extended into the tire repairing container and includes a cover releasably attached to the pipe for releasably blocking the bore of the pipe, and includes a cap releasably blocking the outlet conduit, and an actuating device selectively disengages the cover from the pipe and selectively disengages the cap from the outlet piece for supplying the pressurized air into the tire repairing container and to force the sealing preparation to flow out of the outlet piece.