To realize the global super large field of view (FOV) and medium resolution imaging in satellite ocean remote sensing, we propose a catadioptric multiscale optical system based on the concentric double spherical mirrors with non optical axis. In this paper, according to the non optical axis characteristics of the multiscale optical system objective, the concentric double spherical mirrors with non optical axis characteristics is proposed as the objective to construct the catadioptric multiscale optical system, which can be used in the long wave infrared band (LWIR). Taking the system parameters of MODIS-N as example, the catadioptric multiscale system for LWIR based on concentric double spherical mirror is designed. The system works in the band of 7.5–12.5 μm, the resolution of the sub star point is 325 m, and the imaging FOV is 110°×1.4° (6-channel splicing FOV). The aberration analysis shows that the imaging quality of the system is good. According to the imaging experiment of the single channel prototype, the multiscale design idea based on concentric double spherical mirror is reasonable. © 2022 Elsevier B.V.