In order to reduce the bit error rate of weak light signal detection in laser communication, an underwater weak light signal detection method based on edge computing was proposed. The configuration management service in the edge gateway is used to set the configuration parameters of data collection service and edge computing service functions according to the configuration information issued by the cloud configuration server; Utilize data collection services within the gateway to collect communication signals emitted by underwater laser communication systems and upload them to the data server; The edge computing service in the gateway unloads the edge computing task during the acquisition and transmission of laser communication signals according to the multi-user computing unloading strategy of potential game, and speeds up the efficiency of laser communication signal acquisition and transmission; By calling the laser communication signals stored in the data server through the cloud platform, the bistable stochastic resonance method is used to detect weak laser communication signals. Experiments show that this method can effectively collect laser communication signals and complete the task unloading of edge computing; This method can effectively detect weak light signals in laser communication; At different signal-to-noise ratios and communication link lengths, the error rate of weak light signal detection using this method is relatively low.