NOVELTY - Preparing active ammonia-storing porous active mixture containing carbon fiber, comprises (in parts by wt.): mixing industrial anhydrous calcium chloride salt powder (48-90) with industrial ball clay (2-15), carbon fiber (1-8), deionized water (4-17), and industrial ethanol (3-15); mechanically stirring; filling into a tank; mechanically agitating to remove the air gap; heating the tank in a vacuum oven; removing water and ethanol; vacuumizing; sealing a feeding port; preparing active ammonia-storing active mixture as complete porous solid block; and introducing the ammonia gas into the tank.    USE - The porous active mixture containing carbon fiber is useful for ammonia adsorption storage of selective catalytic reduction- and fuel cell electric vehicle systems.    ADVANTAGE - The porous active mixture containing carbon fiber: has enhanced ammonia storage properties; ensures fast release of ammonia gas and is recyclable without being broken; exhibits improved adsorption and desorption characteristics; and meets the demand of future vehicle industry.    DETAILED DESCRIPTION - Preparing active ammonia-storing porous active mixture containing carbon fiber, comprises (in parts by wt.): mixing industrial anhydrous calcium chloride salt powder (48-90) with industrial ball clay (2-15), carbon fiber (1-8), deionized water (4-17), and industrial ethanol (3-15); mechanically stirring into a homogenous mixture of wet material; filling into a tank such that the filling amount does not exceed 80% of the tank volume; mechanically agitating for 5-10 minutes to remove the air gap; slowly heating the tank in a vacuum oven under atmospheric pressure; maintaining the temperature at 65-160 degrees C; removing water and ethanol to obtain a constant mixture weight; vacuumizing to 550 mbar, at constant temperature and pressure for 0. 5-3 hours; removing the tank and sealing a feeding port; preparing active ammonia-storing active mixture as a complete porous solid block; and introducing the ammonia gas into the tank at a pressure of 0.05-0.8 MPa until the mixture adsorbs the ammonia gas to a saturation.