Precise positioning device for extra-long steel pipe column in reverse construction method and construction method

The invention provides a reverse construction method extra-long steel pipe column accurate positioning device and a construction method. The reverse construction method extra-long steel pipe column accurate positioning device comprises a high-precision gyro inclinometer and a laser target center which are installed at the two ends of a steel pipe column, and the high-precision gyro inclinometer and the laser target center are coaxial with the steel pipe column; when the steel pipe column is hoisted, the perpendicularity of the hoisted steel pipe column is monitored in real time through a high-precision gyro inclinometer; when the steel pipe column is installed, the steel pipe column is hoisted into the steel pipe sleeve, the top of the steel pipe column falls on the supporting and adjusting device, a perpendicularity adjusting device is arranged between the middle of the steel pipe column and the steel pipe sleeve, and the steel pipe column and the steel pipe sleeve are adjusted to be coaxial through the supp