The utility model relates to an electric sunshade curtain convenient to disassemble and assemble a synchronous belt connecting piece, which comprises a motor, a synchronous wheel, a synchronous belt and the synchronous belt connecting piece, the upper surface and the lower surface of the body of the synchronous belt connecting piece are flat smooth surfaces, the four side surfaces of the body are provided with ventilation slots, and the body is provided with a power cavity for fixing the synchronous belt. A power cavity is formed in the body, a rack-shaped notch meshed with the synchronous belt is formed in the power cavity, a small cavity is formed in the body, a large cavity is formed in the body, and a balance cavity is formed in the body. A buckle support is installed on the back face of the body, the buckle support is in a Z shape, and a fixing end, a connecting end fixedly connected with curtain cloth and an installation hole are arranged on the buckle support. The power cavity, the large cavity, the small cavity and the like are formed in the body, the synchronous belt can be directly fixed after being placed in the power cavity, then the curtain cloth is pulled to move up and down through the buckle support, and the large cavity and the small cavity can reserve a space for containing a second synchronous belt.