Geocofferdam bag filled with sand and concrete and cofferdam structure

The utility model provides a geocofferdam bag filled with sand and concrete and a cofferdam structure, the geocofferdam bag filled with sand and concrete comprises a geomembrane bag, the two ends of the geomembrane bag are filled with concrete, the middle of the geomembrane bag is filled with sand, and a blocking part is arranged in the middle to prevent the concrete and the sand from being mixed, so that the stability of the geomembrane bag is better. The utility model further provides a cofferdam structure based on the geotechnical cofferdam bag, the cofferdam structure is formed by stacking a plurality of the geotechnical cofferdam bags from bottom to top, the lengths of the sand filling cavities of the geotechnical cofferdam bags are the same, and the blocking parts are located on the same straight line. The length of the concrete filling cavity of the lower geotechnical cofferdam bag is larger than that of the concrete filling cavity of the upper geotechnical cofferdam bag, slopes are formed at the two e