The invention discloses an assembled type water guide canal structure for a river and lake water system and with convenient sand extraction. The assembled type water guide canal structure for the river and lake water system and with the convenient sand extraction comprises a seat plate, a flat plate, a side plate and a second filter net. A connecting plate is fixedly welded to the right end of theseat plate, a limiting device is connected to the inner side of a second pressure plate, an inserting rod is connected to the left end of the seat plate, a shaft rod located above a fixed matching lug is arranged on the inner side of the flat plate, and a rotating rod is arranged on the outer side of a connecting disc. A collection tank is formed in the seat plate, and an extraction device is connected to the inner side of the collection tank. According to the assembled type water guide canal structure for the river and lake water system and with the convenient sand extraction, rapid buildingis convenient, the stability of the structure is ensured, the effect of filtration and precipitation to the sand is ensured, and the filter net adjustment is convenient according to a specific waterlevel; and the rapid disassembly and assembly are convenient, the assembly is facilitated, the sand is conveniently extracted, and the use for a long time and high efficiency is facilitated.