For the propagation delay in the cloud computing framework, it is increasingly difficult to meet the requirements of low delay and reliability of the power Internet of things. Based on the mobile edge computing framework, a cloud edge network structure based on the power Internet of things is proposed, models the service response delay, solves the optimization model through the combination of constraint optimization and improved genetic algorithm, and obtains the optimal computing unloading strategy. The effectiveness of unloading strategy is verified by simulation. The results show that this strategy can not only improve the reliability of business processing, but also greatly reduce the delay of business response in the case of failure. This study provides some references for the development of mobile edge computing.