The invention provides a cultivation growing process for optical quartz crystal, which comprises the following steps: step1. optical quartz crystal is incised, the incision direction and the optical axis of the optical quartz crystal are at a 45-degree angle, and meanwhile the incision surface is parallel to the optical axis of the optical quartz crystal, slices are taken out, and 45-degree trimming cultivation crystal seeds are obtained; step2, the 45-degree trimming cultivation crystal seeds are placed into a high pressure autoclave and single sides of the 45-degree trimming cultivation crystal seeds are cultivated to cause the 45-degree trimming cultivation crystal seeds to grow, thus obtaining 45-degree trimming crystals, namely, the optical quartz crystal for processing jumbo size optical piezoid. The process can cultivate and grow the optical quartz crystal which can process the jumbo size optical piezoid by changing the trimming of the seed crystal and has the advantages of simple process and easy cultivation.