Perpendicularity detection ruler for metro secant pile construction

The utility model discloses a vertical detection ruler for metro secant pile construction, which comprises a measuring column, two ends of the measuring column are respectively provided with a base, one of the bases is provided with a connecting rod, the connecting rod is provided with a plumb line, the measuring column is provided with a measuring ruler rod, the measuring ruler rod comprises a measuring ruler, the measuring ruler is provided with a groove, and the groove is provided with a through hole. The plumb line comprises a suspension line, one end of the suspension line is provided with a lead weight, the other end of the suspension line penetrates through the connecting rod and is fixed with the connecting rod, and the suspension line is arranged in the groove. The measuring scale and the groove are arranged and used in cooperation with the plumb line, the plumb line is rapidly stabilized, time is saved, and work efficiency is improved; and the measuring column is arranged to realize lifting of the m