The invention provides a method and device for processing alarm data of a refining system. The method for processing the alarm data of the refining system comprises the steps that the alarm data of the refining system are received, wherein the alarm data include the identification data of all sensors in the refining system and the parameter data acquired by all the sensors; node alarm processing data and sensor group alarm processing data are generated according to the identification data of all the sensors; sensor abnormal alarm processing data and single sensor alarm processing data are generated according to the parameter data acquired by all the sensors; an alarm data processing result of the refining system is generated according to the node alarm processing data, the sensor group alarm processing data, the sensor abnormal alarm processing data and the single sensor alarm processing data. According to the method and device for processing the alarm data of the refining system, the single sensor alarm method, the sensor group alarm method and sensor abnormity adjustment are combined to achieve intelligent alarming of the refining system, redundant alarms are reduced, mistaken alarms are reduced, the alarm omission frequency is reduced, the processing efficiency of operator is improved, and the safety of the system is improved.