A cage capable of preventing fish from scrambling food comprises a plurality of retractable crossbeams which are on a same plane, one end of each crossbeam is connected with one end of another crossbeam, and each crossbeam is provided with an adjustment knob. A support is vertically connected to the other end of each crossbeam, and a vertical bar is connected to the ends, which are connected together, of the plurality of crossbeams. An upper shaft ring sleeves the vertical bar and is connected with a plurality of horizontal rods. A lower shaft ring sleeves the vertical bar and is connected with a plurality of L-shaped rods. The cage capable of preventing fish from scrambling food disclosed by the invention can effectively control the fish of different physique sizes to enter the cage for food intake by adjusting the distance in the cage architecture, thereby avoiding the phenomenon that weak and small fish have not enough nutrition and become death caused by inability of catching and eating food.