It is an automatic coal preparation unit to obtain the coal dust used for firing clay at the tunnel or hoffmann kilns in the brick and roofing tile plants. Closed-system fan-type coal crushers, a fan discharging the crushed coal out of the crusher, cyclone and filter in order to de-dust the environment are used in the system. By means of this closed system, environmental pollution is prevented and production is carried out in a clean environment. It is possible to produce crushed coal of size 200-2000 microns depending on the characteristics of the coal, kiln or raw material.