Safe and stable operation of cable network pipeline in distribution network is of great significance to power supply safety and power consumption reliability. Aiming at the problem of single monitoring variable and centralized data processing in the existing online monitoring of distribution network pipeline, this paper studies an operating monitoring method based on edge computing with multi-source data evaluation. Firstly, the structure of multi-source data monitoring system for cable network pipeline based on edge computing is discussed. Then, a random forest based multi-source data evaluation method for real-time monitoring of cable network operation is proposed. Finally, simulation experiment results verify the effectiveness of the proposed method in operation evaluation of cable network pipeline.