Novel positioning device suitable for bottom of steel pylon and construction method

The invention discloses a novel positioning device suitable for the bottom of a steel pylon and a construction method. The novel positioning device comprises a positioning frame unit, a supporting unit and a connecting unit. The positioning frame unit comprises a transverse linkage beam, a transverse linkage beam connecting device, a first positioning adjusting block and a second positioning adjusting block; the supporting unit comprises a first concrete buttress, a second concrete buttress and a third concrete buttress; the connecting unit comprises an inverted-T-shaped blocking head plate, an I-shaped steel sealing plate and a steel base. The high-strength long round bolt holes and the high-strength round bolt holes are formed in the steel base, the positioning adjusting block, the inverted-T-shaped head blocking plate and the I-shaped steel sealing plate, so that the positioning device can achieve rapid positioning, meanwhile, the adjustable range of 20 mm can be achieved according to the actual positionin