The invention discloses an electric power system reliability evaluation system and method based on Monte Carlo simulation. The system comprises a cluster server hardware system, wherein the cluster server hardware system comprises a main server and a sub server which are mutually connected, the main server is taken as a management node to carry out Monte Carlo simulation, database reading and writing, calculation task distribution and calculation result statistics, the sub server is taken as a parallel calculation node, a sampling state issued by the main server is read, parallel calculation is realized, and the calculation result is uploaded to a main server database. The method comprises steps that 1), the cluster server hardware system is established; 2), original data is acquired and processed; 3), Monte Carlo simulation sampling is realized by the man server through utilizing a state sampling method; 4), parallel calculation of task distribution is carried out; and 5), parallel reliability evaluation and parallel calculation are accomplished. The system and the method are advantaged in that various fault states of the electric power system can be accurately simulated, the reliability index is accurate, the Monte Carlo simulation calculation speed and efficiency are improved, the system and the method are suitable for reliability evaluation on the large-scale and multi-equipment electric power system, and the system and the method are more rapid and effective.