An LED light structure with combination device has at least including plural LED lights and plural fixing bases, wherein the LED light having a protruding portion mounted at one side thereof and the protruding portion having a thread mounted thereon for fixing with the fixing base which is a metal base with high heat sinking efficiency, and the fixing base has a through trough with a thread mounted thereinside, which is matching to the thread on the protruding portion of the LED light, so as to screw with the protruding portion of the LED light in a tight matching. Here, the protruding portion of the LED light can be a T shaped track and the fixing base can correspondingly have a T shaped trough matching to the shape of the protruding portion of the LED light, so that the LED light and the fixing base can be tightly embedded together.