Weld stainless steel, Kovar, titanium, aluminum, copper and other metal alloy materials in a vacuum environment. The vacuum box can reach a maximum vacuum degree of 10^-5Pa. There are monitoring, dust removal, rotary chuck, lens protection and other systems in the box, which can complete the welding of complex graphics with high precision. The equipment fully considers the influence of vacuum environment on laser welding, and can meet the processing of all products with vacuum requirements for welding, especially for vacuum laser welding of precision products. It has greatly improved the weld porosity defects and weld formation.