The utility model discloses a can change LED panel light of area size, including PC frame, bottom plate, LED light source, light guide plate, fin and fixed subassembly, the PC frame is lamp face's four sides parcel, and the PC frame passes through the bolt fastening around lamp face, the bottom plate is fixed through improvement type phenol -formaldehyde resin adhesive and light guide plate, and the right side of light guide plate is provided with the reflecting plate, the aluminium base board of PCB is installed to the bottom of LED light source, and the LED light source passes through the aluminium base board of PCB and fix on the fin, the reflector panel is installed to the both sides of LED light source, and the LED light source is symmetrical formula and installs in the inner wall both sides of PC frame, the right side of LED light source is provided with the diffuser plate, fixed subassembly includes recess and protruding piece, just states recess and protruding setting on the lateral wall of PC frame, through fixed orifices fixed connection. The utility model discloses need not not be equipped with the rectangular panel material again, reduce enterprise's die sinking, the inventory cost that prepares material, change the single aluminum alloy frame style of panel light, prevent that the electrical property is safer.