The invention discloses an NSGA-II algorithm-based wheel set turning repair strategy optimizing method. According to the method, the existing wheel set turning repair strategy serves as an object, a multi-target optimizing model is established by taking the longest service life of a wheel set and the shortest turning repair times as targets, the traditional NSGA-II local density calculation method is changed with respect to the characteristic that the wheel set turning repair strategy requires that the turning repair time is as less as possible, a genetic operator is changed, and the wheel set turning repair strategy is effectively optimized.