The invention discloses a Selective Laser Melting forming device for multiple metal powder materials. Technical solutions adopted are as follows: a collector container, a build cylinder and a feed container are provided on a lower portion of a process chamber; leveling oil cylinders for the substrate are mounted in the build cylinder; a recoater bracket in the process chamber is slidably mounted on a slide rail; a recoater is fixed on a lower portion of the recoater bracket; a compaction roller is simultaneously mounted on the recoater bracket; a stress sensor is provided under the compaction roller; an electron microscope for collecting the porosity of the spread powder and the product and a melting pool monitoring Charge Coupled Device camera; a laser scanning system, a directional heating laser system and an alarm device are provided on a top portion of the process chamber.