The invention relates to a sagger material crusher. The sagger material crusher comprises a support, a roller way conveying line, a lifting frame, a lifting frame driving device, a translation device, a crushing knife, a crushing knife lifting device and an outer cover, wherein the roller bed conveying line is arranged on the support in the left-right direction, the lifting frame driving device is arranged on the support and is arranged at the lower part of the lifting frame driving device, a sagger bearing surface is arranged on the lifting frame, when the lifting frame is located at the lowest point of the stroke, the sagger bearing surface is located below the roller way top surface of the roller way conveying line, the translation device is arranged on the support, the crushing knife lifting device is arranged on the translation device is driven by the translation device to move left and right, the crushing knife is arranged at the lower end of the crushing knife lifting device, the crushing knife, the crushing knife lifting device and the translation device are located above the roller way conveying line, and the outer cover is arranged on the support. The sagger material crusher has the advantages that cohesive solid materials in a sagger can be crushed to the maximum degree, and therefore the problem that the solid materials in the sagger cannot be poured into a hopper can be effectively solved.