Abstract: A connecting device for light fixtures has a lens fixing plate, a light fixture assembly, a button, a first spring, a connecting rod and a buckle. The buckle is fixedly connected to the light fixture assembly. A mounting base is disposed on the lens fixing plate. One end of the connecting rod is located in an inner cavity of the mounting base and the other end thereof is extended out from the mounting base. The end of the connecting rod extending out from the mounting base is provided with a boss, and the connecting rod located in the inner cavity of the mounting base is sleeved with the first spring. The button is connected to the end of the connecting rod located in the inner cavity of the mounting base.