Endoscope imaging system

The invention discloses an endoscope imaging system. The endoscope imaging system sequentially comprises first window glass, a diaphragm, a lens subsystem, second window glass and a detection imaging element from an object side to an image side along an optical axis, the first window glass and the second window glass are used for protecting lenses in the lens subsystem; the detection imaging element is used for displaying an image formed by the lens subsystem; from the object side to the image side along the optical axis, the lens subsystem sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power and a third lens group with positive focal power, a second lens group with negative focal power, wherein the second lens group comprises at least one negative lens sub-group with negative focal power; the second lens group is used for diverging the light; a third lens group with positive focal power, wherein the third lens group comprises at least one positive