The present invention discloses a high-strength modular ceiling lamp installation structure, which relates to the technical field of ceiling lamps. The present invention includes a mounting plate, a ceiling lamp and a mounting groove. A mounting groove is provided on one surface of the mounting plate, a ceiling lamp is installed inside the mounting groove, a transverse fixing plate is installed on one surface of the ceiling lamp, two opposite side surfaces of the transverse fixing plate are connected with fixing parts, one end of the fixing part is connected with the ceiling lamp buckle, a telescopic rod is connected to one surface of the mounting groove, one end of the telescopic rod is connected with a limit plate, the limit plate is adapted to the ceiling lamp, and the limit plate extends out of the ceiling lamp, a mounting rail is installed on one surface of the mounting plate, and a mounting block is connected to one surface of the mounting rail. The modular ceiling lamp of the present invention uses a transverse fixing plate in combination with a plurality of fixing parts to install and fix ceiling lamp groups, the transverse fixing plate serves as an auxiliary supporting member, and the fixing parts directly fix and connect the ceiling lamp to the transverse fixing plate, so as to provide higher support strength for the ceiling lamp.