The invention discloses a fuzz testing method and system suitable for 376.1 protocol safety defect detection. The method comprises the following steps: setting bidirectional proxy between a power-using information acquisition terminal and a Peach server, wherein the Peach server generates a testing data packet and sends to the power-using information acquisition terminal through the bidirectionalproxy to perform the testing; monitoring an abnormal situation of the power-using information acquisition terminal; sending the monitored abnormal distortion data packet to the power-using informationacquisition terminal to perform the reproduction, recording the reproducible data packet for the subsequent analysis; the system comprises the Peach server and a bidirectional proxy module, wherein the bidirectional proxy module sends the data packet received from the Peach server to the power-using information acquisition terminal from a fixed port; the Peach server comprises a data generation unit, a monitoring unit and a Publisher unit, and is used for generating the testing data and sending the testing data to the power-using information acquisition terminal through the bidirectional proxy module, and performing the monitoring.