The invention provides an ultra-precision ultra-stability ultra-agility control in-orbit verification method. First, function and performance index requirements of ultra-precision ultra-stability ultra-agility control in-orbit verification are determined, hardware and software parts required by the in-orbit verification method are designed according to the requirements, and are assembled into an in-orbit verification system, then function and performance requirements of ultra-precision ultra-stability ultra-agility control are verified through a ground test result, an in-orbit test process andscheme of the in-orbit verification method are perfected, and an in-orbit test result is completed to verify ultra-precision ultra-stability ultra-agility control effects. The ultra-precision ultra-stability ultra-agility control in-orbit verification method provided by the invention provides a feasible verification scheme for in-orbit verification of ultra-precision ultra-stability ultra-agilitycontrol of a spacecraft, and tests and verifies the function and performance index requirements through a ground test, and thus has very high use value.