The invention discloses a method for preparing sintered bricks from river mud. The method comprises the steps as follows: smashing and grinding ceramic waste, cement dust, cinders, coal gangue, the river mud, lithium bentonite, calcined kaolin, calcium carbonate, sepiolite, ceramsite, glass beads, pumice, slag, lime and expanded perlite; adding water until the water content is 8wt%-10wt%, and extruding the mixture into adobe by a vacuum brick extruding machine; airing, sintering and cooling the adobe to obtain the sintered bricks made of the river mud. With the adoption of the method, not only can waste be turned into treasure and resources be saved, but also the ecological environment is protected very well, and the product is high in pressure bearing capacity, low in density and low in cost.