The present invention relates to a split-type fusion sight, comprising a sight main body. An aiming assembly connecting base is arranged at the top of the main body; the aiming assembly connecting base comprises an engagement groove located on the front side, and an engagement base located on the rear side; an engagement block is arranged in the middle of the engagement groove, and a wire arranging base is arranged on the right side of the engagement base; the aiming assembly connecting base is further provided with connecting screw holes. The split-type fusion sight can fuse the low-light-level night vision or thermal imaging lens imaging with human eye observation of a target to assist in observing or determining the target, and then determines the aiming target by means of an aiming light point, thereby performing accurate shooting. In addition, the low-light-level night vision or thermal imaging lens imaging module is arranged above the sight main body, and is fixedly connected by means of the aiming assembly connecting base and connecting screws. It is convenient to replace the low-light-level night vision module or thermal imaging module, the sight main body does not need to be disassembled, and disassembly and replacement are more convenient.