A ceiling light fixture includes a mounting bracket, two retaining members pivotally mounted on two ends of the mounting bracket respectively, a light module mounted on the mounting bracket, and an outer disk mounted on the light module. The light module is retained by the two retaining members. The light module is provided with two connecting portions and a plurality of locking members. Each of the two connecting portions is provided with two retaining grooves locked onto one of the two retaining members. The outer disk is provided with a plurality of elastic plates. Each of the elastic plates of the outer disk is locked onto one of the locking members of the light module.