The utility model provides a hydraulic control lock on machine of lifting, includes: bracket, a pair of bolt, safeties seat, addendum cone, hydro -cylinder and elastic restoration part, wherein: the bracket sets up on the safeties seat, and a pair of bolt slides respectively and sets up the both ends in the bracket, is provided with elastic restoration part on a pair of bolt respectively, and on the hydro -cylinder was fixed in the safeties seat, the addendum cone was fixed in the hydro -cylinder top. The utility model discloses guarantee that scraped car lifts the safety of function.