The invention discloses an engineer station software historical data processing method based on a DCS platform of a nuclear power plant. The method comprises a storage step, wherein the storage step comprises the steps of: adopting an engineer station process management module to open up a new thread, wherein the new thread records the real-time data of a nuclear power station production system, and the process of obtaining the real-time data is that: a front interface thread is adopted to be responsible for receiving the real-time data, and the real-time data is pushed into the new thread ina message queue mode; and in the data storage step: storing the real-time data by the new thread in a file mode, wherein when the data is stored in the fire mode, the real-time data is cut into a plurality of sub-files according to the size and the time sequence, the size of each file is subjected to preset of the maximum value according to the current hardware and software, and when each sub fileis stored and according to the key data point in each sub file content, the key data points are extracted to construct an index file. The engineer station software historical data processing method adopts the time point monitoring display originally, that is, both historical data and abnormal data are displayed through a time point list, and therefore, rapid monitoring is guaranteed.