A selective laser sintering device, comprising: 1) a laser forming unit; 2) a support platform; and 3) a driving mechanism; wherein: the support platform is configured to support a plurality of raw materials for additive manufacturing of an object comprising a plurality of sections; the laser forming unit is disposed on the support platform and is configured to lay powders on a surface of each section of the object and sinter the powders; the driving mechanism is disposed under the laser forming unit and comprises a vertical driving mechanism and a horizontal driving mechanism; the vertical driving mechanism is connected to the laser forming unit and configured to lift the laser forming unit layer by layer according to a height of each section of the object so that the object is processed in a vertical direction with respect to the support platform; and the horizontal driving mechanism is configured to drive the laser forming unit to move in a horizontal direction with respect to the support platform so that the laser forming unit moves over the support platform or separates from the support platform; wherein the laser forming unit comprises a housing, a separator, a powder laying unit, a lasering unit, and a plurality of heating units; the powder laying unit is disposed in the housing and comprises a plurality of powder cylinders and a roller; the plurality of powder cylinders is symmetrically disposed on both sides of the support platform; the roller is configured to move back and forth between the plurality of powder cylinders and the support platform to bring powders in the plurality of powder cylinders to the support platform; the separator is disposed in the housing and divides the housing to a first half and a second half; the lasering unit is disposed in the first half, comprises a laser and an oscillating mirror, and is configured to emit a laser to sinter the powders on the support platform; the plurality of heating units is disposed in the second half and is configured to preheat the powders on the support platform prior to the sintering of the powders. 1) a laser forming unit; 2) a support platform; and 3) a driving mechanism; the support platform is configured to support a plurality of raw materials for additive manufacturing of an object comprising a plurality of sections; the laser forming unit is disposed on the support platform and is configured to lay powders on a surface of each section of the object and sinter the powders; the driving mechanism is disposed under the laser forming unit and comprises a vertical driving mechanism and a horizontal driving mechanism; the vertical driving mechanism is connected to the laser forming unit and configured to lift the laser forming unit layer by layer according to a height of each section of the object so that the object is processed in a vertical direction with respect to the support platform; and the horizontal driving mechanism is configured to drive the laser forming unit to move in a horizontal direction with respect to the support platform so that the laser forming unit moves over the support platform or separates from the support platform; wherein the laser forming unit comprises a housing, a separator, a powder laying unit, a lasering unit, and a plurality of heating units; the powder laying unit is disposed in the housing and comprises a plurality of powder cylinders and a roller; the plurality of powder cylinders is symmetrically disposed on both sides of the support platform; the roller is configured to move back and forth between the plurality of powder cylinders and the support platform to bring powders in the plurality of powder cylinders to the support platform; the separator is disposed in the housing and divides the housing to a first half and a second half; the lasering unit is disposed in the first half, comprises a laser and an oscillating mirror, and is configured to emit a laser to sinter the powders on the support platform; the plurality of heating units is disposed in the second half and is configured to preheat the powders on the support platform prior to the sintering of the powders.