The utility model discloses an ash storehouse presses down dirt system, catch collection device 3 including suction hood device 1, negative pressure pipe network system 2, dust, but suction hood device 1 sets up to extending structure, suction hood device 1 is connected to 2 one end of negative pressure pipe network system, 2 other ends of negative pressure pipe network system are connected the dust and are caught collection device 3. The utility model discloses can be according to the characteristic of different ash samples, go on single, a plurality of grey storehouses press down the global design of dirt system to dust to the in-process of unloading produces is controlled, controls heat ash and the vapor that the stirring water contact produced, and the discharge opening is adjustable with carriage bottom distance, can concentrate the collection to dust and vapor, handles, has solved power plant's ash storehouse biax mixer and in the raise dust problem that the in-process of unloading exists, has realized that power plant's ash storehouse regional environment health and staff are healthy. To the design of carrying out production strictly in line with rules and regulations of grey reservoir area from now on to and the design of similar discharge zone, like sediment storehouse etc. All there are better reference and directive significance.