The invention relates to a fabricated type anti-buckling inversed L-shaped web shear piece combined joint connecting device capable of recovering functions, and belongs to the field of structural engineering. A fabricated type anti-buckling inversed L-shaped web shear piece combined joint is composed of a square steel pipe column with a cantilever beam segment, an I-shaped combined beam segment and a group of combined connecting devices; pouring of concrete plates in the combined beam and welding parts of rivets and a joint connecting device can be completed in a factory, the welding seam precision and quality are controlled easier, and the construction speed and quality are greatly improved; an upper flange inner cover plate of the combined connecting device is arranged into an inner cover plate type by using an anti-buckling idea for flange cover plate buckling amplitude value control; a lower flange outer cover plate is arranged into an outer cover plate type, and good performance visuality and replacement decidability are achieved; and structural damage positions under the seismic load action can occur in energy dissipation member positions such as high-strength bolts and connecting plates which are easy to replace through targeted design, post-seismic repair is facilitated, and the fabricated type anti-buckling inversed L-shaped web shear piece combined joint connecting device is applied to development requirements of a fabricated type steel structure capable of recovering the functions.