Aiming at the demand to high precision gear in automobile transmission industry, a dual-workpiece spindle grinding machine tool combining forming grinding wheel with worm wheel was developed. The machine tool had automatic tool change and automatic loading/unloading machined gear functions. The worm wheel and the forming grinding wheel could be trimmed with a general purpose machine at the same time.The dual-workpiece spindle structure saved loading/unloading time,then the processing efficiency was improved greatly, higher than the single spindle efficiency about 30%.Under appropriate rough grinding and fine grinding wheel particles, the combination of worm wheel and forming grinding wheel could greatly reduce the grinding time by about 50%.With gear testing equipment, gear grinding quantity could be detected online to judge whether the processing requirements were met. So high efficiency, high precision, energy saving and environmental protection gear grinding processing is realized.