Aiming at the problem that network security evaluation indexes are one-sided and difficult to strictly quantify, an AHP (Analytic Hierarchy Process) and grey correlation-based multidimensional network security evaluation method is proposed. The method includes the steps of 1. establishing a multidimensional network security evaluation model; 2. determining weights of factors contained in each model of the multidimensional network security evaluation model established in Step 1 based on the AHP; and 3. quantifying network security based on a grey correlation theory: representing security of a network to be evaluated through quantification of a similar degree.