The invention discloses a security testing method for a power data network. A security test is performed on the data network according to an operation state of the power data network; and a security test implementation process comprises a preparatory stage, an identification stage, an analysis stage and a risk control planning stage, wherein the preparatory stage comprises the steps of determiningan evaluation range, establishing an evaluation organization, determining an evaluation tool, determining a risk control strategy for a risk evaluation process, compiling a risk evaluation scheme, and performing risk evaluation training and evaluation object backup, so as to guarantee that risk evaluation can be implemented smoothly and orderly according to a plan and a risk is controllable; theidentification stage comprises the steps of finishing asset identification, threat identification, vulnerability identification and security measure identification, thereby providing a basis for the analysis stage; and the analysis stage comprises the steps of arranging on the basis of the identification and performing asset analysis, threat analysis, vulnerability analysis, security measure analysis and comprehensive risk analysis, thereby drawing a conclusion for a security risk level of the power data network.