Periscopic high-resolution varifocal optical system with small volume and low cost

The utility model discloses a periscopic high-resolution varifocal optical system with small volume and low cost, more particularly relates to an optical system applied to camera, mobile phone and monitoring system. The system comprises a first lens cluster, a second lens cluster, a third lens cluster, a fourth lens cluster and a sensitive chip between which the spacing can be adjusted, wherein, adiaphragm is arranged in front of the third lens cluster and a lens with a changeable optical axis is arranged between a first lens and a second lens of the first lens cluster; the combined focal length of the first lens cluster, the second lens cluster, the third lens cluster and the fourth lens cluster are respectively positive, negative, positive and positive. The periscopic high-resolution varifocal optical system has the characteristics of small volume, changeable optical axis, low cost and the like.