The present invention provides a method for improving stability of a direct current restarting system by employing a power rotation band. The method employs a direct current healthy pole power rotation band capability to calculate the minimum power rotation band time of the healthy pole based on a time domain simulation method so as to improve the stability of the system after the direct current restarting and ensure the safe and stable operation of the extra-high voltage alternating current/direct current power grid. The method for improving stability of a direct current restarting system by employing a power rotation band may be used for power grid program and operation calculation, provides technology support for system analysis personnel, is widely applied and has substantial social benefit and economic benefit.