A micro-objective lens, characterized in that the lens comprises a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, a sixth lens group, a seventh lens group, an eighth lens group, a ninth lens group and a tenth lens group with optical axis arranged in a sequence from left to right;
- the focal length of the first lens group is negative;
- the second lens group belongs to doublet, in which the focal length of the first and second lens is positive and negative, respectively;
- the focal length of the third lens group is positive;
- the fourth and fifth lens groups belongs to doublets, in which the focal length of the first and second lens in each group is negative and positive respectively;
- the focal length of the sixth lens group is positive;
- the focal length of the seventh and eighth lens groups is negative;
- the focal length of the ninth and tenth lens groups is positive.