The invention discloses a visual processing method for gun muzzle flow field data, which is used to solve the technical problem of low visual processing capability of the conventional gun muzzle flow field data processing method. The method adopts the technical scheme that angle-radius-based initial data in the .xlsx format is converted into test data in the .xlsx format, which is based on location coordinates, through the software Excel; a text source data file in the .txt format is generated through a text editor; the text source data file in the .txt format is converted into an operation data file in the .lay format through the flow field analysis software Tecplot 360; a flow field contour map data file in the .lay format is generated; and a visual graph file in the .jpeg format is exported. The method provided by the invention has the advantages that through generation of a muzzle flow field contour map with continuous changes and visual processing, all location areas with identical values can be identified, and a distribution layer of tested data can be viewed, so that the visual processing capability for the muzzle flow field data is improved.