Based on the throwing-motion theory and the fluidization separation principle, a vibrating fluidized bed separator whose distributor was set to a negative-angle was designed. The results of gangue transportation with/without dense medium in the vibrating fluidized bed separator showed that a series of problems caused by gangue transportation with a scraper in gas-solid fluidized bed were solved. Without dense medium, the migration force and the transportation velocity increased with increasing installation angle of the separator. The vibration inertia force along the distributor was increased with increasing throwing index. With dense medium, vibration energy stimulated the activity of dense medium, and the transportation performance of the separator was increased with increasing superficial gas velocity and throwing index.