The invention discloses an information safety penetration testing method for a distribution automation system. Penetration testing is carried out on a master station system, a distribution network terminal and a communication channel, the information system vulnerability penetration testing technology is fully used, the safety of the distribution automation system is evaluated by simulating the attack method of a hacker, and the information safety penetration testing method includes the active analysis for any weakness, technical defects or loopholes of the master station system, the communication circuit and the distribution network terminal. The information safety penetration testing method for the distribution automation system can be used for safety risk analysis work before the distribution automation system is connected to the internet, guidance is provided for finishing problem rectification and reformation and retest work of manufacturers with safety risks, and the method is high in pertinence and wide in test range. Compared with a traditional penetration testing method, the test time can be largely shortened, offline repairing events caused by safety problem failures after equipment is on line are reduced, the information safety penetration testing for the distribution automation system is realized, and the information safety penetration testing method can be applied to industrial control systems inside and outside the industry.