The invention relates to an automatic multicolor printer, comprising a case, a conveying mechanism, two lifting mechanisms, a plurality of plate pushing mechanisms, a moving bench, a printing mechanism and a protective mechanism, wherein the conveying mechanism, the lifting mechanisms, the plurality of plate pushing mechanisms, the moving bench, the printing mechanism and the protective mechanismare mounted on the case; the conveying mechanism is positioned in the case, the lifting mechanisms are positioned at two ends of the case and face the conveying mechanism, the plate pushing mechanismsare positioned above the conveying mechanism, the moving bench is positioned above the plate pushing mechanisms, the printing mechanism is positioned above the moving bench, and the protective mechanism is positioned above the printing mechanism. The printing mechanism includes a driving supporting device mounted on the case, a mesh plate supporting device mounted on the driving supporting device, and a stencil printing device slidably arranged on the mesh plate supporting device, and the stencil printing device is connected with the driving supporting device. When driving, the driving supporting device pulls the stencil printing device to reciprocate on the mesh plate supporting device to perform printing. The automatic multicolor printer allows workers to just place and pick material atthe two ends during printing and provides automated processing, the efficiency is high, and the quality is good.