Crushing device for sand making machine

The utility model discloses a crushing device for a sand making machine, which belongs to the technical field of crushing devices, and comprises a crushing box, two crushing rollers are rotatably arranged in the crushing box, the two crushing rollers are in transmission connection through two mutually meshed gears, a motor is fixedly arranged on the side wall of the crushing box, and the motor is in transmission connection with the crushing box. The output end of the motor is fixedly connected with one of the crushing rollers, a screening barrel is fixedly arranged at the bottom end of the crushing box, a screening frame is fixedly arranged in the screening barrel, an auger is rotationally arranged in the screening frame, and a transmission mechanism for controlling the auger to rotate is arranged between the auger and the crushing rollers. Through the screening barrel arranged at the bottom end of the crushing box, after a worker puts gravel into the crushing device to be crushed, the crushed gravel is conve