The invention relates to an automatic hoisting and mounting machine for special glass fiber reinforced plastic isolating piers for expressway maintenance. The automatic hoisting and mounting machine comprises a base, a hoisting frame device, a grabbing device and a clearing device, wherein the base comprises a supporting bottom plate and four universal wheels; the bottom of the hoisting frame device is connected with the top of the supporting bottom plate; the grabbing device is mounted on the hoisting frame device; the clearing device is positioned at the left side of the grabbing device; and the clearing device is mounted on the hoisting frame device. The automatic hoisting and mounting device can solve the problems that working efficiency is low, labor intensity is great, mounting holes of isolating piers cannot be effectively cleared, danger is easily generated in a carrying process of the isolating piers, the isolating piers cannot be positioned and mounted, and the like when the isolating piers are mounted in the prior art, realizes a function of automatically positioning and mounting the isolating piers, and has the advantages of being high in working efficiency, small in labor intensity, capable of completely clearing the mounting holes of the isolating piers, free of danger during mechanical carrying of the isolating piers, and capable of positioning and mounting the isolating piers.