Satellite-borne operating system kernel on-orbit reconstruction method and device

The invention discloses a satellite-borne operating system kernel on-orbit reconstruction method, which comprises the following steps that minimum system software starting self-checking is carried out in the cold starting process of a satellite-borne computer, and the minimum system software of the satellite-borne computer enters a privileged state under the condition that a satellite service software system cannot work normally; the minimum system software carries out self-inspection on a plurality of stored satellite-borne operating system mirror images and establishes operating system mirror image partition damage identifiers; downloading a detection result identifier that the satellite service software system cannot work normally and an operation system mirror image partition damage identifier to a ground measurement and control station through a telemetering channel; the minimum system software receives a satellite service software system operating system kernel mirror image partition number and a mirror