The horizontal double-spindle double-tray CNC lathe is a horizontal double-spindle double-tray CNC lathe with double spindles and double pallets. The maximum rotation diameter of the bed is 1000mm and the linear axis stroke is 2000mm. After searching, there are industry standards in the technical field of horizontal dual-spindle dual-carriage CNC lathes, but these standards cannot meet the product acceptance needs. This standard specifies the structural type, general requirements, geometric accuracy, position accuracy and product working accuracy. It is suitable for horizontal double spindle double carriage CNC lathes with a maximum bed rotation diameter of 1000mm and a linear axis stroke of 2000mm.