Quick-release platform of 3D printer

The utility model discloses a quick-release platform of a 3D (three-dimensional) printer, which belongs to the technical field of 3D printing equipment and comprises a working platform, a mounting seat and a printing cantilever. One end of the mounting seat is mounted on the working platform; the printing cantilever comprises a cantilever body, a handle and a telescopic column, the cantilever body is mounted at the other end of the mounting base, a containing groove with an upward opening is formed in the cantilever body, and the handle is rotatably connected into the containing groove; the telescopic column is embedded in the containing groove and is in threaded connection with the handle, and the telescopic column can extend out of the containing groove or return into the containing groove along with rotation of the handle; and when the end part of the telescopic column extends out of the accommodating groove, the end part of the telescopic column is propped against the inner side wall of the mounting hole,