The invention discloses a power grid safety correction control method considering constraint priority. During real-time running of a power grid, power flow of relevant equipment exceeds a limit due torapid increase of a load and a power grid fault, and the out-of-limit equipment is needed to be restored to a normal state by an adjustment machine set. The method proposed by the invention considerspriority of a constraint condition, the quantity, which cannot be corrected, of the constraint condition is added into a target function by a corresponding penalty factor, a safety correction controlmodel considering constraint priority is built, iterative solution is performed by employing a linear planning method, so that a safety correction control strategy can be accurately obtained. The linear planning method considering the constraint priority is easy to implement, the problem of difficulty in solving the correction control strategy caused by multiple branches and fraction coupling during actual running of the power grid is solved, a secondary optimal solution for relieving limit exceeding of the equipment can be given out according to the priority, and the power grid safety correction control method had certain promotion value and application prospect.