Centering and center line control device

The utility model relates to a centering and center line control device which comprises a girder arranged at a well mouth, a hanging basket is arranged below the girder, a center line frame is weldedat the top of the hanging basket, and a center line hole is formed in the center line frame. A fixed pulley and a steel ruler with scales are welded on the center line frame; a supporting rod is arranged in the center line hole in the horizontal direction. A hook is arranged on the supporting rod; the upper part of the steel wire rope is connected with the support rod through a hook; the steel wire rope is hung on the hook and is connected with the manual winch through the fixed pulley; the steel wire rope is released by the manual capstan, and the pendant moves downwards. The centering and center line control device is simple in structure, convenient to operate on site, and simple and easy to operate; the measurement precision is high, only a center line swing error exists, and the erroris within an allowed range