Deep-hole large-diameter pile foundation reinforcement cage mounting and lowering positioning device

A deep-hole large-diameter pile foundation reinforcement cage installing, lowering and positioning device comprises a supporting mechanism and a hoisting mechanism, and the hoisting mechanism is arranged on one side of the supporting mechanism; the two ends of the assembly frames are fixedly connected with the extension arms, one group of extension arms are arranged at the tops of one ends of the assembly frames, the other group of extension arms are arranged at the bottoms of the other ends of the assembly frames, a plurality of adjusting holes are formed in the extension arms, the assembly frames are connected end to end through the extension arms to form a closed loop, and the extension arms are fixedly connected by inserting first sleeves into the adjusting holes; the relative position of the sliding frame and the assembling frame is adjusted, so that the position of the supporting arm relative to the reinforcement cage is adjusted, the supporting arm is pushed to slide on the sliding frame, the supportin