Directional accelerated crystallization device for tunnel drainage system

The utility model relates to the technical field of tunnel drainage, and particularly discloses a directional accelerated crystallization device for a tunnel drainage system and a using method, the directional accelerated crystallization device comprises a crystallizing pond assembly, a felt layer and a medicine box assembly, the crystallizing pond assembly comprises a crystallizing pond, and a pond cover is arranged at the top of the crystallizing pond; the crystallizing pond comprises a front wall, a rear wall, an outer wall and an inner wall; the medicine box assembly comprises a medicine storage box, a horizontal net-shaped medicine clamping box is arranged at the box bottom of the medicine storage box and is of a double-layer hollow net-shaped structure, the bottom of the medicine storage box is communicated with the net-shaped medicine clamping box, and reaction medicine is placed in the net-shaped medicine clamping box. Influences of temperature, flow velocity, chemicals, shape and surface morphology o