The invention provides a graphic processing method for a computer human-computer interaction interface. The method comprises the steps of 1), obtaining the size of a data file and the displayed size,and calculating an extraction ratio; 2), extracting characteristic data from the file according to the extraction ratio; 3), drawing the extracted data into a graph. The method extracts the data fromoriginal data for display according to the data amount and the display size instead of processing and displaying all the data, so that the data processing amount is reduced, and the situation that a display interface is stuck and even cannot respond to user actions due to excessive data processing amount is avoided. The invention further provides a graphic processing device for the computer human-computer interaction interface. The graphic processing device comprises a data storage module, an extraction module and a drawing module.