The invention relates to a multi-axle simultaneously-lifting device of a photovoltaic polycrystalline silicon ingot furnace bottom, comprising a multi-axle motion controller, three servo drivers, three servo motors, transmission mechanisms of the three servo motors, three ball screws and worm and gear assemblies, wherein the multi-axle motion controller is respectively connected with the three servo motors through motion control buses; the output end of each servo driver is connected with the input end of one servo motor; the output end of each servo motor is connected with each ball screw and each worm and gear assembly through the transmission mechanism of the servo motor; and the three ball screws and the worm and gear assemblies are respectively fixedly connected with the photovoltaic polycrystalline silicon ingot-casting furnace bottom through mechanical devices. The invention has the advantages of high control accuracy and convenient debugging and setting, enhances the production efficiency and shortens the production periods of polycrystalline silicon ingots.