The invention discloses a grower and a growing method of a laser crystal that belongs to YAS series with large size and no core, which belongs to the crystallization technology of the laser crystal. The invention comprises the grower adopting a Mo crucible pulling method heated by resistance and the crystal growing method comprising two procedures and four phases. The laser crystal of YAS series provided by the invention has large size of 35 to 50mm, high concentration (reaching 2.0at percent), no core, no dislocation and no scattering. In addition, the growing technology is stable; growing cycle is short; cost is low; and the yield of the crystal is high with above 85 percent.