The invention relates to a hemispherical space visible light fifteen-fold continuous large zoom optical system and belongs to the field of aerospace visible light detection. The invention realizes themilitary purpose of searching for a target in a case of a large field of view with a small focal length and identifying a target in a case of a small field of view with a long focal length. The system consists of a total of 11 lenses in the front fixed group, the variable magnification group, the compensation group and the rear fixed group on the same optical axis. The operating band of the system is 0.48-0.70 [mu]m; the continuous zoom range is 60-900mm; the F number is from 2.0 to 5.0; the detector scale is 4k * 4k; and the size of the system single pixel is 6.5[mu]m * 6.5[mu]m. The targetcan be detected and identified in a hemispherical space with a 360 DEG range of panoramic viewing angles. The system has good image quality and compact structure. When the Nyquist frequency is 45 lp/mm, the MTF value is greater than 0.4, and the total length of the system is less than 800 mm.