The invention discloses a valve booster. The valve booster comprises a handle and a first connecting rod; a through hole is formed in the first connecting rod; the handle is inserted in the first connecting rod through the through hole; the first connecting rod is fixedly connected with the upper end of an extension rod; the lower end of the extension rod is coated with a second connecting rod; at least three lugs are arranged on the outer wall of the lower end of the second connecting rod; one end of an ejector rod is movably connected with the lugs; and a calliper is arranged at the other end of the ejector rod. The valve booster can solve the difficulty of manually opening a valve of a pressure pipe.