Positioning device for pile foundation construction steel casing

The utility model relates to a positioning device for a pile foundation construction steel casing. The positioning device comprises a positioning device and a measuring device, the positioning device is composed of a fixing frame and hydraulic devices, the fixing frame is of a rectangular structure, the hydraulic devices are arranged in the centers of the four edges of the fixing frame, each hydraulic device is provided with a telescopic rod and a supporting rod, one end of each telescopic rod is provided with an arc-shaped base plate, the arc-shaped base plates are connected with the steel casing, and the supporting rods are fixedly connected with the fixing frame; the measuring device comprises a positioning frame erected on the steel casing, the positioning frame is composed of two positioning rods which intersect perpendicularly, a prism is arranged at the center point of the perpendicular intersection position of the positioning rods, each positioning rod is provided with a fixing screw and a movable gro