The main engine of the machine tool is composed of the bed, beam, dust extraction part, Z-axis device, operation control part, air circuit, water circuit and other parts. The bed adopts a hollow structure, which can avoid the thermal deformation of the machine tool caused by the high heat of the laser. The machine base designed by the principle of structural dynamic design and the variable analysis technology of the finite element method has an overall welding structure with excellent dynamic and static characteristics. The base is a welded frame structure, which has undergone professional large-scale welding, secondary aging treatment, and precision machining by large-scale gantry milling machines. These design and processing methods ensure that the machine tool has excellent shock resistance, high rigidity and stability.