The invention relates to a process for preparing vacuum glass. The steps of the process are, (1) keeping a leaking plate mould flat on a glass substrate, on which die orifices are equispaced and compartmentally prepared, (2) coating the supporting pulp on the leaking plate mould to form backstops which are distributed compartmentally and have the same height, inverting the glass substrate on bottom glass, (3) preparing an opening which is inserted in a suction glass tube on the glass, and adopting supporting pulp to seal edges, (4) putting the glass into a heating furnace and treating, (5) connecting the suction glass with a vacuum device until vacuum degree in the vacuum glass reaches 10-2-10-4Pa, hot fusing and sealing the glass tube, thereby obtaining vacuum glass finished products. The invention has the advantages of simple preparation technology, easy operation, lower investment, lower rejection rate, perfect quality and higher production efficiency. Further, the invention adopts mechanical separator system to replace manual operation, which effectively reduces costs of vacuum glass and is applicable for industrial production.