The invention discloses a filter cake crushing system and a filter cake crushing method for multiple press filters. The system comprises a filter cake queuing buffer feeding system, a crushing and mixing system, a computer digital control system and the like. Multiple press filters with extremely high instantaneous change, interruption, difficult management in peak and many faults can be simultaneously coordinated to crush filter cakes; by adopting the filter cake crushing system and the filter cake crushing method for the multiple press filters to crush the filter cakes of the multiple press filters, the effects of stable operation, reliability, few fault and no blockage can be achieved, and adverse influence of the link on production is further reduced; and the filter cake crushing system and the filter cake crushing method for the multiple press filters are simple in management, are particularly suitable to be used in big plants with annual treatment capacity of 2 million tons, and are more favorable for use in occasions where the press filters are quickly turned on and filter cake viscosity and filter cake moisture change are high.