In the separation of oil shale using gas–solid separation fluidized beds, the waste rocks fall on the distribution plate after separation and the scraper fails to discharge them in time, causing the airflow entering the bed to be redistributed. Due to its unique secondary layout effect on airflow, the existence of stacking beds is an important factor affecting the stability of the fluidized bed, and indirectly affects the separation performance of gas–solid fluidized beds. Therefore, it is necessary to carry out further research on the stacking bed to provide a strong basis for optimizing the practical operation and sorting performance of the gas–solid fluidized bed. Here, the effects of stacked beds on energy consumption, density uniformity, and bed stability were systematically analyzed experimentally. The results showed that the secondary accumulation bed has a synergistic effect on the fluidization stability of the bed and can improve the fluidization quality of the ordinary bed. Oil shale was sorted under optimized test operating conditions (accumulation height HS = 35 mm, accumulation particle diameter D = 6 mm, fluidization number N = 1.3), and the refined mineral yield was 29.85%, oil yield was 9.42%, tail mineral yield was 70.15%, and oil yield was 1.54%. The possible deviation, E, was 0.085.