The invention relates to a three-view-filed axial zoom infrared optical system. The three-view-filed axial zoom infrared optical system comprises a front mirror set, a reflecting mirror set and a rear mirror set which are arranged in sequence. The front mirror set comprises an object mirror, a zoom mirror, a compensating mirror and four fixed mirrors, and the object mirror, the zoom mirror, the compensating mirror and the four fixed mirrors are coaxially arranged in sequence. The reflecting mirror set comprises three sequentially arranged reflecting mirrors. The rear mirror set comprises two convergent mirrors which are coaxially arranged in sequence. The rear mirror set is located on the reflecting optical path of the third reflecting mirror. According to the three-view-filed axial zoom infrared optical system, the three view fields can be changed just through axial movement of the zoom mirror and the compensating mirror, the compensating mirror only has two positions in the three-view-filed state, the compensating mirror also serves as a focusing mirror to compensate defocus caused by temperature, and therefore control difficulty is greatly lowered. The three fixed reflecting mirrors are adopted, an object image can be rotated through space bending, the problem that the direction of an adopted detector refrigerating machine is the same as the direction of a long edge is solved, the risk of pipe bending of the detector refrigerating machine is avoided, and the three-view-filed axial zoom infrared optical system is compact in structure, is provided with a simple movement mechanism and achieves miniaturization and low weight.