In order to solve the problem of high leakage rate of the access layer network traffic detection method of power IoT, a Monte Carlo method based on the access layer network traffic detection method of power IoT is designed. Combining techniques such as higher-order modulation, improving the power IoT architecture, calculating the degree of randomness of the data blocks obtained quantitatively, extracting access layer features and security requirements, resetting the power window values again, and optimising the network traffic detection model based on Monte Carlo methods. Experimental results: The mean values of the leakage rate of the power IoT access layer network traffic detection method in the paper are: 1.355%, 17.003% and 5.223% for DoS attack, client poisoning and SSH scenarios respectively, indicating that the advantages of the designed power IoT access layer network traffic detection method are more obvious after the full integration of the Monte Carlo method.