The invention discloses a method for evaluating reactive power reserves of an electric power system from the point of view of steady-state voltage stability, and belongs to the technical field of electric power system dispatching and operating. The method disclosed by the invention aims at carrying out eigenvalue analysis on a flow Jacobian matrix for steady-state voltage stability analysis, an eigenvalue whose ratio with the minimum eigenvalue is small is taken as a key eigenvalue, the comprehensive influence degree of node reactive power reserves for the steady-state voltage stability is reflected by the comprehensive sensitivity of node reactive injection for all of the eigenvalues, a low-voltage safe and stable reactive power reserve is differentiated from a high-voltage safe and stable reactive power reserve, and the sum of static reactive power reserves and the sum of dynamic reactive power reserves of each node which takes the comprehensive sensitivity as a weight are further weighted and accumulated, thereby acting as a low-voltage safe and stable reactive power reserve comprehensive index and a high-voltage safe and stable reactive power reserve comprehensive index. The comprehensive evaluation method provides a technical means for monitoring variations in reactive power reserves of the electric power system and comparing the effective degrees of the reactive power reserves under different operating modes by the dispatching and operating personnel.