Raw material crushing device

The utility model provides a raw material crushing device, relates to crushing machinery technical field, the raw material crushing device comprises a crushing box and a lifting box installed on one side face of the crushing box, the interior of the crushing box is rotatingly connected with two crushing rollers, the top of the crushing box is fixedly connected with a material injection port, and the material injection port is fixedly connected with the lifting box. A dustproof mechanism for sealing the bottom of the injection port is arranged on the inner top wall of the crushing box; screened large raw materials slide to the inclined end of the screen plate and fall into the lifting box through a material channel, the materials are lifted to the upper portion of the crushing box again through a lifting mechanism in the lifting box, the materials fall into the two crushing rollers again to be crushed again, and therefore the effect of automatic circulating crushing is achieved, manual feeding is not needed ag