The invention discloses an automatic production device for plates. The automatic production device for the plates comprises a manufacturing device for expanded perlite particles. The manufacturing device for the expanded perlite particles comprises an ore crushing device, a preheating device and a high-temperature expansion device. The preheating device is connected to the bottom end of the ore crushing device, and the high-temperature expansion device is connected to the bottom end of the side wall of the preheating device. The ore crushing device comprises a crushing box, the cross section of the crushing box is in a conical shape, and a feeding pipe is connected to the top end of the crushing box. Two crushing rollers and a filtering net are arranged in the crushing box, the filtering net is located below the crushing roller, and each crushing rollers comprises a first crushing rotor and a second crushing rotor. According to the automatic production device for the plates, through arrangement of a heating box, a drying box and a draught fan, vapor is eliminated while the perlite particles are heated instantaneously, heat can be recycled, and energy consumption is reduced; and meanwhile, through arrangement of deceleration blocks, adjustment of the heating and expanding time for the perlite particles is achieved.