The utility model discloses a crushing device for flux production. Box body, a feeding hopper penetrates through the left side of the top of the box body; the left side of the inner wall of the box body is fixedly connected with a supporting plate. The top of the supporting plate is fixedly connected with a motor; an output shaft of the motor is fixedly connected with a rotating shaft through a coupler; the surface of one end of the rotating shaft is fixedly connected with a rotating wheel, the front face of the rotating wheel is fixedly connected with a driving shaft, the left side and the right side of the top of the supporting plate are connected with a moving block and a sliding block in a sliding mode respectively, and the top of the sliding block is fixedly connected with a moving plate. According to the smashing device for flux production, large combustion improvers can be smashed into small combustion improvers for the first time, then the small combustion improvers are smashedinto powder through the smashing rollers, the smashing efficiency of the combustion improvers is improved, the smashing effect of the combustion improvers is better, the two smashing devices are driven by one motor to operate, energy is saved, and the environment is protected.