The invention aims to provide a network storm resisting method for process layer equipment of a digital substation. The process of FPGA storm restraining and the process of CPU storm restraining are adopted to be combined, and a time-sharing flow limiting method is adopted for achieving network storm filtering; according to the process of FPGA network storm restraining, a front-arranged filtering module is arranged on an FPGA, the module finishes calculating CRC check codes and frame byte xor codes after receiving a message, the CRC check codes and frame byte xor codes are compared with CRC check codes and frame byte xor codes of the previous frame, if the codes are the same, the current message is discarded, and the CRC check codes and frame byte xor codes are saved and used for judging a message of the next frame; the process of CPU storm restraining comprises a process of network storm restraining of a CPU application layer and a process of network storm restraining of a CPU drive layer. According to the method, the problem that due to network abnormity of the process layer of the digital substation, maloperation or operation rejection of the equipment are caused is solved, and operation reliability of the process layer equipment is enhanced.