Magnetic steel automatic assembly device, including the frame and set on the rack workbench, equipped with conveying mounting parts conveying mechanism, also equipped with automatic conveying of magnetic steel and magnetic steel assembly mechanism for assembling magnetic steel into the installation parts. The structure design is reasonable, through the setting of the installation parts conveying mechanism, magnetic steel conveying mechanism and magnetic steel assembly mechanism, to achieve the installation parts and magnetic steel automatic feeding, assembly, high degree of automation, reduce labor, reduce production costs, improve product quality.