The invention relates to a stone plate pressing machine. The stone plate pressing machine is characterized by comprising an upper beam, a main cylinder, a side cylinder, an upper sliding block, a lower beam, an ejector cylinder, an auxiliary ejector cylinder, a workbench, a stand column and a safety mechanism. A safety bolt, a buffering device and a pressing device are arranged on a guide column, and therefore the requirement of the pressing machine for the safety mechanism is met, wherein the buffering device and the pressing device are matched with the safety bolt. Meanwhile, the top end of an elevating device is provided with a rolling wheel and rolling groove structure matched with the workbench, and the problem that a large amount of space is occupied when an elevating mechanism and a movable rolling groove of the workbench are not located in the same plane is solved.