The invention discloses a hot-gas fluidized bed and a separation method therefore, which belongs to the field of dry-process mineral processing and is particularly suitable for dry-process coal preparation. The hot-gas fluidized bed and the separation method therefore comprise the prior air dense-medium fluidized-bed separation method, and are characterized that upflow supplied for the fluidization of a dense-medium bed is hot airflow. When the separation method is adopted for separation, the fluidized bed can achieve the functions of effectively removing water or modifying dry states by the self, can continuously operate for a long time, can reliably operate under high air humidity, reduces the blockage of sieve plates, improves operation efficiency, has high reliability, and is easy to implement. The method is a novel dry-process separation method in the mineral processing industry.