The invention discloses an embedded replaceable LED office illuminating lamp. The embedded replaceable LED office illuminating lamp comprises a lamp shell and a lampshade, wherein the lamp shell comprises a top plate and side plates on the two sides of the long edge of the top plate, and the lampshade is inserted into the lamp shell; an end plate is arranged on each of the two sides of the wide edge of the top plate, a bottom plate which extends outwards is arranged on the bottom side of the lamp shell, the bottom plate extends out of the side plates and the end plates, and moreover, the outeredge of the bottom plate is arranged on a mounting keel during installation; at least one of the two side edges of the parts, corresponding to the side plates, of the bottom plate is provided with ahanging plate, the hanging plate is installed on the lower side of the bottom plate through a plurality of connecting mechanisms and is movably connected with the bottom plate, the hanging plate can slide towards the outer side of the bottom plate in a horizontal moving mode through the cooperation among the hanging plate and the connecting mechanisms, and a locking mechanism is further arranged so as to a lock the hanging plate at the position arrived after the hanging plate horizontally moves on the bottom plate. According to the provided embedded lamp, assembling and disassembling are convenient, by means of structures of an old lamp panel such as the keel, the installation work can be rapidly completed without components assembled together, moreover, after installation, the fixation isfirm, the appearance is attractive, the wide product acceptance degree is achieved.